Service & Parts

Construction Machinery

Service & Parts | Maintenance |

1

FL936F Power System Malfunction

Phenomenon of Malfunction
The loss of engine machine oil is huge.
Judgment of Malfunction
1、Oil leakage in engine surface;
2、Incorrect machine oil type;
3、Oil leakage in oil cooler;
4、Damage of turbocharger;
5、Air leakage of crank case that causes leakage of machine oil;
6、Sealing failure of piston ring and valve lifter.
Troubleshooting
Check whether the surface of engine is oil spilling, whether the type of machine oil is correct, and there is no abnormal condition. Know that the user changed the turbocharger two days ago through observation and inquiry. Remove the vent-pipe of the turbocharger, find that machine oil leakage at the end of vent-pipe, check and find that the turbocharger is damaged and causes the leakage of oil. Change the turbocharger and the Malfunction is removed.
2

FL936F Power System Malfunction

Phenomenon of Malfunction
The cooling water is muddy, grey and the machine oil is dark grey.
Judgment of Malfunction
The Malfunction shows that the machine oil mixes with the cooling water due to:
1、Damage of oil cooler;
2、Damage of cylinder head gasket;
3、Flaws on cylinder head or other Malfunctions.
Troubleshooting
Remove oil cooler, check and find oil leakage in oil cooler that causes the mix of oil and water. Change the oil cooler and the Malfunction is so removed.
3

FL917F Hydraulic System Malfunction

Phenomenon of Malfunction
The noise is loud while working, the temperature of hydraulic oil is too high. The working device of loader works slowly and weakly.
Judgment of Malfunction
1、The oil absorption filter element of hydraulic oil tank is blocked;
2、Lacking of hydraulic oil and the working pump absorbs nothing;
3、The oil inlet of the working pump is loose and air goes in while absorbing oil;
4、Interior damage of gear pump and the inner discharge is serious;
5、Damage of operating cylinder seal ring.
Troubleshooting
Check and find that it is not lack of hydraulic oil but there are a great quantity of small bubbles that cause the muddy of hydraulic oil. Check and find the oil aborbing pipe pf working pump is loose, and air comes in due to negative pressure when the working pump is absorbing oil causes noise, high temperature and workless of working devices.
4

FL917F Electrical System Malfunction

Phenomenon of Malfunction
The water temperature instrument of engine shows high temperature, which exceeds normal indication range after working for an hour.
Judgment of Malfunction
1、The loosening of fan belt;
2、Damage of thermostat;
3、Damage of water pump;
4、Overloaded loader and insufficient heat dissipation of engine cause high water temperature;
5、Oversized deviation of thermosensitive value of water temperature sensor or damaged sensor;
6、Inaccurate meter reading and fake high temperature of instrument;
7、Lacking of or losing efficacy of cooling medium.
Troubleshooting
Check whether the fan belt, thermostat and water pump, etc. is in good condition. Check whether the cooling medium is sufficient and effective. Judge the signal Malfunction of sensor and instrument and change the sensor so as to remove the Malfunction.
5

FL917F Electrical System Malfunction

Phenomenon of Malfunction
Air-condition does not work and control panel is not powered.
Judgment of Malfunction
1、Burning loss of air-condition’s fuse;
2、Damage of control panel circuit;
3、Damage of high and low pressure switch;
4、Without freezing medium;
5、Leakage of refrigerating system;
6、Damage of air compressor.
Troubleshooting
Check air-condition’s fuse, in case of any burning loss, change it and the air compressor doesn’t work while the control panel of the air-condition is charged. Short circuit of the high and low pressure switch of air-condition, the air condition compressor actuates, and find that there is no freezing medium in the liquid storage pot, stop the vehicle and check from the high and low pressure end of air-condition. In case there is no freezing medium inside, and judge that the air-condition pipeline is damaged, change pipeline freezing medium and remove the Malfunction.
6

FL956F Transmission System Malfunction

Phenomenon of Malfunction
High temperature of transmission oil.
Judgment of Malfunction
1、Too little transmission oil;
2、With water in oil;
3、Burn down or incomplete separation of friction plate inside box;
4、Hindered oil-way.
Troubleshooting
First, check the liquid level of transmission oil and finds the oil level normal; check other oils and find them normal; then check whether the oil-way is fluent, in case the transmission oil filter element is blocked, change it to remove the Malfunction.

7

FL956F Transmission System Malfunction

Phenomenon of Malfunction
The loader can’t walk (with normal engine).
Judgment of Malfunction
1、 Insufficient oil in torque converter;
2、 Unable to be put in gear;
3、 Low speed change pressure;
4、Broken magnetic valve;
5、Inner damage of torque converter;
6、Inner Malfunction of gear box.
Troubleshooting
Start the engine and find there is no speed change pressure; shut down and open the torque converter inspection window, use wrench to turn torque converter, in case the torque converter may be easily turned while the engine does not, it is judged as fracture of flexible junction plate. Change the flexible junction plate to remove the Malfunction.
8

FL956F Brake System Malfunction

Phenomenon of Malfunction
Poor braking effect of front wheel.
Judgment of Malfunction
1、Damage of brake friction plate;
2、Insufficient of brake oil;
3、Leakage of brake line;
4、Block of brake sub-pump;
5、Damage of brake master pump.
Troubleshooting
1、Check the brake friction plates and they are normal, within the wear range;
2、Check the brake fluid and it's normal and the oils are normal;
3、Check to see whether there is leakage of brake line and make sure there is no leakage;
4、Check operating condition of brake sub-pump and find the pump damaged, change it to remove the Malfunction.
9

FL958G Electrical System Malfunction

Phenomenon of Malfunction
High water temperature of engine.
Judgment of Malfunction
1. Blocking of engine cooling fins and inner water channel;
2. Insufficient of cooling liquid;
3. Damage of engine water-thermometer;
4. Damage of engine water temperature sensor;
5. Damage of engine thermostat;
6. Loosened fan belt;
7. Damage of water pump.
Troubleshooting
Check to see whether the engine cooling fins are block, and the cooling liquid is normal. Check to see whether the water temperature sensor is normal. Check the water-thermometer and find the water temperature is not high. Change the water-thermometer to remove the Malfunction.
10

FL958G Electrical System Malfunction

Phenomenon of Malfunction
The air condition is at refrigeration position, but the indicator light is not lighted in the air-condition control panel and there is no cold wind.
Judgment of Malfunction
1. Burning loss of air-condition fuse;
2. No freezing medium;
3. Damage of high and low pressure switch;
4. Damage of control panel line;
5. Damage of air condition compressor.
Troubleshooting
1. Check air-condition fuse and there is no burning loss;
2. Detect freezing medium from the high and low pressure mouth and find it normal;
3. Short circuit of the high and low pressure switch and the compressor doesn't actuate;
4.Use mutimeter to check charging line of hign and low pressure switch and find there is no power;
5. Remove the control panel, connect a posstive wire to refrigeration line. Then find the compressor of air-conditioner actuates and the refrigeration lights on, when starts the loader, the air-consitioner makes cool wind.
11

FR150-7 Power System Malfunction

Phenomenon of Malfunction
The engine is of high temperature after 2 hours working each time.
Judgment of Malfunction
1. Loosened fan belt;
2. External and internal block of cooler;
3. False alarm due to circuits;
4. Water pump Malfunction.
Troubleshooting
1. Check to see whether the belt is normal;
2. Whether the cooler is blocked outside;
3. Use water temperature sensor bonding to test whether it is open circuit;
4. Drain water to check whether the interior of water channel is rusted, etc. If the channel is blocked due to inner rust in water tank, replace the water tank and the Malfunction removes.
12

FR85-7 Electrical System Malfunction

Phenomenon of Malfunction
The electronic control accelerator can not be elevated.
Judgment of Malfunction
1. The accelerator knob needs to be reset;
2. Ineffective of accelerator controller;
3.Ineffective of accelerator electrical machine;
4. Ineffective of accelerator knob;
5. Line problems.
Troubleshooting
1. Reset the accelerator;
2. Check whether the line is normal;
3. Check accelerator knob, accelerator controller and accelerator electrical machine;
4. Check to see whether the accelerator stay wire drops or breaks. and find there is one line from the accelerator knob is improperly connected in the socket connecting accelerator controller and wiring harness.
13

FR60-7 Power System Malfunction

Phenomenon of Malfunction
The engine is of high temperature and boils.
Judgment of Malfunction
1. The thermostat can’t be turned on;
2. Blocked engine water channel;
3. Damaged water pump and loosened belt;
4. Long term overloading of the whole machine;
5. Damage of water temperature sensor;
6. Blocking of cooling fin.
Troubleshooting
1. Disassemble and test thermostat, it is normal;
2. Check and find out there is no blocking in the engine water channel;
3. Disassemble water pump of engine and check, there is no damage;
4. The belt isn't loosened;
5. The  water temperature sensor is normal;
6. Check and find out blocking of cooling fin.
14

FR60-7 Hydraulic System Malfunction

Phenomenon of Malfunction
One side walk and no motion.
Judgment of Malfunction
1. Pilot oil-way blocking;
2. Pilot hand shank damage;
3. Main valve blocking;
4. Main oil-way blocking;
5. Caterpillar band blocking;
6. Walking motor damage.
Troubleshooting
 1. Detect and find out the pressure of pilot oil-way is normal;
2. Pressure of main relief valve is normal;
3. No blocking of caterpillar band;
4. Check and find out the erosion blocking inside the walking reduction gearbox, change the walking mechanism to get right. Remarks: The erosion blocking  of walking reduction gearbox due to un-scheduled maintenance.
15

FR150 Hydraulic System Malfunction

Phenomenon of Malfunction
Occasionally non-automatic idling of engine in automatic idling mode.
Judgment of Malfunction
1. Automatic idling switch Malfunction;
2. Automatic idling line problem;
3. Controller Malfunction;
4. Overtop pilot oil return backpressure.
Troubleshooting
1. Measure to see the automatic idling switch is normal and the line is normal;
2. Turn off automatic idling switch or the short circuit is normal, and exclude the controller Malfunction;
3. Measure and find out the pilot oil return backpressure is 1 MP, and the pressure of hand shank movement switch is set as 1 MP, which being at the critical value causes occasionally no response from the automatic idling, change for a heavy caliber oil return joint and the machine gets right.
16

FR60-7 Electrical System Malfunction

Phenomenon of Malfunction
The machine may not be started, after being charged using the launch key, there is no response.
Judgment of Malfunction
1. Insufficient of electric quantity in storage battery;
2. The storage battery relay does not work;
3. Drop of wiring harness socket;
4. Inner damage of electric lock;
5. Damage of compound relay;
6. Damage of flameout valve time relay;
7. Damage of flameout magnetic valve;
8. Damage of flameout valve relay.
Troubleshooting
1. Check the voltage of storage battery;
2. Check the launch key;
3. Check the storage battery relay;
4. Change storage battery relay and repair the wiring harness of vehicle body and it becomes normal.
17

FR85-7 Electrical System Malfunction

Phenomenon of Malfunction
The instrument panel is charged to alarm and there is revolving speed shown at the same time.
Judgment of Malfunction
1. Improper line iron or short circuit, open circuit;
2. The instrument panel Malfunction;
3. Damage of generator governor.
Troubleshooting
1. Check and find out the iron is normal;
2. Check and find out the line from the generator to the instrument is normal;
3. Lead from Point B of generator to the neutral point joint L, the instrument charged alarm disappears, which indicates that the instrument is normal. Remarks: The revolving speed of YANMA engine is detected through detecting the pulse signal from the neutral point of the generator.
18

FR60-7 Electrical System Malfunction

Phenomenon of Malfunction
The instrument shows accumulator charging alarm after launch.
Judgment of Malfunction
1. Line problem;
2. Instrument Malfunction;
3. Generator Malfunction.
Troubleshooting
1.Check and find out there is no voltage in the middle point of launch  compound relay and we can judge that there is something wrong from the generator to  the middle point of launch  compound relay;
2. Check and find out there is no voltage at the neutral point p of the generator;
3. Check and find out there is no erosion in the generator socket and so that we may judge that there is some Malfunctions inside the generator. After overhauling of the generator, we find that the diode inside is broken. Change the generator and the Malfunction is removed.
19

Judgment and Solving of Diesel Engine Abnormal Sound Problems

When the diesel engine is operating, its sound is continuous and soft. In case of impact, knock, squeal, and other sounds, they are judged as abnormal sounds.
In case of abnormal sound, it is necessary to judge whether the sound are produced from external assemblies or internal of the engine body. The external abnormal sound mainly includes the abnormal sounds produced from the fuel injection pump, air pump and oil pump, while the internal sound mainly includes the abnormal sounds produced from the internal of valve chamber, cylinder liner, crankcase and timing gear, etc. Also, it is required to judge whether the sound is knocking or squealing sound. The metal knocking sound mainly indicates impact and friction, and the squealing sound mainly includes the sounds resulted from air and fuel injection. The abnormal sounds are mainly produced from the following parts.
1. The fuel injection time is too early.
In case of rhythmic, sharp and loud metal knocking sound produced from the cylinder, check that the fuel injection time is obviously too early. So, it is required to adjust the fuel injection advance angle.
2. The fuel injection time is too late.
In case of low and unclear knocking sound, checkthat the fuel injection time is obviously too late. It is required to adjust the fuel injection advance angle.
3. The fit between the piston pin and bushing hole at small end of connecting rod is too loosened.
There is slight and sharp sound during operating of the diesel engine, this kind of sound is particularly clear when the engine is idling. It is required to change the bushing at small end of connecting rod, so as to enable its clearance to be within specified range.
4. The clearance between the piston and cylinder liner is too big.
During operating, you can hear knocking sound at outer wall of the cylinder block, and the sound will become louder while the rotating speed is increasing. This kind of knocking sound is called engine knock. So, it is required to change the piston or the cylinder liner based on the wear condition.
5. The fit clearance is too big because of the wear of connecting rod bushing.
During operating, you can hear a knocking sound produced from the internal parts of the crankcase; when the rotating speed is suddenly decreased, you can hear a loud and strong knock knocking sound. So, it is required to dismantle and inspect the bushing, and replace it if necessary.
6. Radial clearance of the main rolling bearing of the crankshaft is too small (6135 series diesel engines)
There is very sharp and hash sound produced during operating of the engine and the sound become clearer during accelerating; there is scraping sound during operating of the engine in case that radial clearance of the main rolling bearing of the crankshaft is too big. Check the main rolling bearing that produces the sound, and replace it whenever necessary.
7. The front and rear thrust bearings of the crankshaft are worn.
The end play is too big when the thrust bearing is worn, resulting in forward and backward movement of the crankshaft. When the diesel engine is idling, it is able to hear the knocking sound resulted from forward and backward movement of the crankshaft. So, it is required to check the end play and wear degree of the thrust bearing, and replace it whenever necessary.
8. The valve spring is broken off the tappet is bent, and the push rod housing is worn.
After the valve spring is broken off the tappet is bent, and the push rod housing is worn, a rhythmic and slight knocking sound is produced at the cylinder head. It is required to change the damaged parts, and adjust the valve clearance.
9. The valve is collided with the piston.
During operating of the engine, a heavy, even and rhythmic knocking sound is produced from the cylinder head, and you can feel the collision by gently pinching a nut of the cylinder head cover. Then, dismantle the cylinder head cover, check the collision cause, adjust the valve clearance and check whether the piston model is wrong. In case of collision, you can properly deepen the valve relief, or add a red copper spacer with thickness of 0.20mm/0.4mm and shape same to the cylinder head bottom face.
10. The drive gear is worn and its backlash is too big.
In case that the drive gear is worn and its backlash is too big, there is abnormal sound produced from the front cover plate. Sudden deceleration can result in impulsive sound. Adjust the backlash and replace the gear in accordance with the wear condition.
11. There is no oil between the adjusting screw of rocker arm and ball seat of the push rod.
In case of no oil, there is cheeping sound due to dry friction at cylinder head cover. Dismantle the cylinder head cover, inject oil and find out the cause of being lack of oil.
12. The inlet and exhaust valve clearance is too big
When the inlet and exhaust valve clearance is too big, you can hear rhythmic and loud sound produced from the cylinder head cover. It is required to calibrate the valve clearance again.
13. There is abnormal collision sound when the turbocharger is operating.
When the turbocharger produce abnormal collision sound, it is necessary to dismantle the bearing to check whether it is worn and the impeller blade is bent or not, and to measure main clearance, adjust and change the damaged parts, and clean the oil filter and inlet and outlet oil pipeline of the turbocharger, ensure smooth lubricating oil pipeline.
14. There is abnormal sound produced from the fuel injection pump.
In case of lack of lubricating oil, the fuel injection pump is squealed or there is metal impact sound, and the diesel engine is operated at unstable rotating speed. The reason is that the lubricating oil pipe fitting is plugged, and the governor is badly worn. The pipe fitting can be cleared out when the squealing time does not last for a long time. When the squealing time is too long, it is required to change bearing or shaft. It is required to change the governor when it is worn.
20

Working principle of air conditioner of the loader

1. In the air conditioner system, the steam compression cooling circulation is adopted.
2. The compressor is driven by the engine. With the high-temperature and high-pressure coolant steam from the compressor, the heat of the coolant steam in the condenser is carried away by the external air to condensate the high-temperature and high-pressure coolant steam into the high-temperature and high-pressure liquid.
3. Thereafter, the high-temperature and high-pressure liquid flows through the expansion valve. Being throttled by the expansion valve, the coolant is turned into low-temperature and low-pressure liquid to flow into the air conditioner evaporator. At the fixed pressure, the coolant is vaporized to absorb the heat from the air outside of the evaporator pipe to reduce the temperature of circulating air flowing through the evaporator to realize cooling purpose. 
4. The cold air passing through the blower is delivered into the loader to reduce the temperature of inside air. The coolant steam is absorbed into the compressor and turned into high-temperature and high-pressure coolant air which is then compressed into the loader air conditioner condenser through the high-pressure hose to finish a cooling cycle. This cycle will be repeated to maintain the internal temperature at a desired level.
21

Notes for the loader, after the engine is started, are as follows:

(1)  Run the engine at a low speed. If the engine oil pressure gauge cannot point to the normal range within 10 s, identify the cause and do troubleshooting before start; otherwise, engine failure will be caused;
(2)  Before the oil pressure reaches the specified value, high engine speed will damage the turbocharger;
(3)  To enable rapid heating of hydraulic elements, operate the control levels of the working device repeatedly to make the preheated hydraulic oil flow in all hydraulic cylinders and lines circularly;
(4)  After starting, run the engine at an idle speed for 5-10 min, and you cannot start driving unless the water temperature reaches 55 °C and the low brake pressure alarm buzzer does not sound;
(5) Do not run the engine continuously at a high or low speed at N position for more than 20 min;
(6)  If it is necessary to run the engine at N position, apply a load from time to time or let the engine run at a medium speed.
22

Engine oil level check

① Park the loader on a flat surface. Stop the engine and, after 10 min, get the oil in the crankcase completely returned back to the engine oil pan.
② Pull out the oil dipstick and clean it with a piece of clean cloth; re-insert it to the bottom of engine oil tank from the oil filler, then re-pull it out and check whether the oil level falls between scales “L” and “H”.
③ If the oil level is lower than “L”, add oil; if the oil level is higher than “H”, remove the bottom oil-drain plug for oil drainage.
23

Engine oil change

① When the time for engine oil change is reached, park the loader on a flat surface and stop the engine after the coolant temperature reaches 60℃. Remove the bottom oil-drain plug to drain the oil which is collected with a container, and replace the oil filter.
② Re-mount the oil-drain bolt and add the approved oil from the oil filler until the level reaches “H”. Idle the engine and check the oil filter and oil-drain plug for leakage.
③ Stop the engine and, after 10 min, get the oil completely returned back to the oil pan. Then, check the oil level which shall be between “L” and “H”.
24

Analysis on failure of loader starter to crank

Fault causes:
(1) Power failure
The battery has severe loss of power or vulcanized or short-circuited plate, the battery terminal has poor contact with the wire clip, and the starting circuit has poor contact due to loose wire connection.
(2) Starter fault
The commutator has poor contact with the electric brush, the excitation or armature winding is open or short circuited, the insulation brush is grounded, and the solenoid switch coil is open, short-circuited or grounded, or has contact ablation.
(3) Starting relay fault
The starting relay coil is open, short-circuited or grounded, or has poor contact.
(4) Ignition switch fault
The ignition switch wiring is loose or has poor internal contact.
(5) Starting system circuit fault
The starting system circuit is open, or its wiring has poor contact or loose connection.
Troubleshooting methods:
(1) Check the power supply
Press the horn or turn on the headlamp. If a low or hoarse sound is heard from the horn and the light is much dimmer than usual, there may have a power failure.
(2) Check the starter
Use a screwdriver to short the terminal connecting the battery to the motor conducting strip on the solenoid switch of the starter. If the starter does not crank there may have a fault in the motor and the starter shall be disassembled for repair.
(3) Check the solenoid switch
Use a screwdriver to short the terminal connecting the starting relay on the solenoid switch to the terminal connecting the battery. If the starter does not crank, there may have a fault in the solenoid switch of the starter, which shall be disassembled for repair.
(4) Check the starting relay
Use a screwdriver to short the “battery” terminal to the “starter” terminal on the starting relay. If the starter cranks, there may have a fault in the starting relay or the next step shall be proceeded.
(5) Check the ignition switch and wire
Connect the starting relay “battery” to the ignition switch with a wire. If the starter runs normally, there may have a fault in the wire, which shall be repaired.
25

Pilot Valve for Foton Lovol Construction Machinery

1)Components
1 Pushrod 2. Armature 3. Handle 4. Body
2)Functions
The pilot valve is equipped with a control lever. The bucket can be moved to the forward position, neutral position or backward position. The boom can be moved to the lifting position, neutral position, falling position or floating position. The lifting, floating and backward positions are equipped with electromagnet for positioning.
The function of the hydraulic system of the loader is to control the movement of the boom and the bucket.
3)Operation
When the control lever of the pilot valve is in the neutral position, the slide valve is in the initial position. As a result, both the oil inlet chamber and the oil return chamber are not connected, but the control port is connected with the oil return chamber, and each valve rod of the multi-way valve is in neutral in the effect of the spring.

When the control lever is pulled to the falling position, the pressure pin will push the pressure lever to move downward, so that the metering spring will push the metering valve element to move downward to cut off the passage between the control chamber and the return chamber and to connect the inlet chamber with the control chamber. As a result, the pilot pressure oil flows to the side of the multi-way valve to push its slide valve to move to achieve the reversing action. Meanwhile, the hydraulic pressure of the control chamber is applied to the lower end of the metering valve element and to balance against the spring force. If the control lever is held in a certain position, the spring force will keep constant, resulting in a constant pressure in the control chamber. This is similar to the course of action of a fixed pressure reducing valve. The spring force changes with the pivot angle of the control lever, that is, the larger the pivot angle, the larger the spring force, and the higher the control chamber pressure, so that the thrust acting on the valve element of the multi-way valve will also increase accordingly. That is to say, the stroke of the valve element of the main valve is directly proportional to the pivot angle of the control lever of the pilot valve to achieve the proportional pilot control.

When the control lever is pulled to the floating position from the falling position continuously, as electromagnet positioning is equipped in this position, the pilot valve will be locked. The oil pressure at the control port increases enough to open the sequence valve in the pilot valve. The hydraulic oil in the discharge channel K of the multi-way valve flows into the reservoir through the drain port 2C of the pilot valve to open the fill valve in the small chamber of the boom cylinder. As a result, P, A2, B2 and T are connected to achieve the floating of the boom. When the pilot valve is pulled out of the floating position and released, the reset spring will push the pressure lever to rise, so that the control lever will return to the neutral position.
When the control lever of the pilot valve is pulled to the full lifting or retraction position of the bucket, the control lever will be locked for positioning. When the boom or bucket reaches the limited height or the limited bucket angle, the proximity switch will be activated, so that the solenoid coil will be de-energized, resulting in loss of magnetic force. As a result, the control lever will return to the neutral position automatically in the effect of the reset spring.

26

Regular Maintenance of Engine

1. Checking the coolant level and temperature
Observe the coolant level through the inspection hole. If the coolant level is low, open the radiator cap and pour the coolant into the reserve tank.
Attention: Always press down the air-bleed button before opening the radiator cap to prevent the coolant from spraying out, seriously scalding you, while the engine is hot.
2. Checking the engine oil level
Never start the diesel engine when the oil level is below the lower mark or above the upper mark of the dipstick. To check the oil level, turn off the diesel engine and let it sit for 5 minutes to allow the oil to return back to the oil pan fully. The difference of the oil quantity between the upper mark and the lower mark of the dipstick is 3L.
3. Checking the fuel level
Check the fuel level indicator in the instrument panel. If necessary, add fuel in time.
4. Checking water leakage, air leakage and oil leakage
Check the outer surface of the diesel engine for water leakage, air leakage and oil leakage.
5. Checking the fan
Visually check the fan blade for damage, and whether its connecting bolts are tightened.
6. Checking the belt
The belt is tightened through the belt tensioner. Check the belt for tension by pressing the belt with hand.
7. Checking whether the exhaust color is normal
The normal exhaust color is light gray. If not, find the reason for change in color and remove it.
8. Checking whether the sound is normal
9. Checking whether the speed and vibration are normal
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