5-19
3. Clean and inspect the radiator fins
Clean every 500 hours.
Dust on the outer surface of the radiator (water tank) will affect the cooling effect and shall be cleaned in time.
Open the engine hood and blow away the dust or leaves and other debris that block the oil cooler fins of the radiator fins
with high-pressure water or compressed air. Clean the protective net in front of the oil cooler at the same time. For
machines equipped with air-conditioning, the condenser fins shall also be cleaned.
Warning: If compressed air, high-pressure water and steam hit the body directly, or use
them to blow away dust or dirt, there is a danger of serious injury. Goggles, dust masks
and other protective masks shall be used.
Note: In order to prevent damage to the radiator fins, the distance between the nozzle of high-pressure water
or compressed air and the surface of the radiator (water tank) shall be greater than 500 mm.
A damaged radiator fins may cause water leakage or overheating. In dusty sites, check the radiator fins every
day regardless of the maintenance cycle.
4. Change the coolant
Perform the first replacement after 50 hours of operation.
Change it every 1000 hours thereafter.
1) Remove the radiator (water tank) cover, unscrew the
water drain valve, and drain the coolant;
2) Clean the cooling circuit, close the water drain valve, fill
up the special cleaning fluid, then start the engine,
operate the engine at low speed for 10 minutes, and then
stop the engine to discharge the cleaning fluid;
3) Close the water drain valve again;
4) Fill up the coolant, make the engine idle for a few
minutes, so that the coolant fills the entire cooling circuit;
5) Check the coolant level and replenish the coolant.
Warning: Do not open the radiator (water tank) cover from a hot engine. The radiator cover
shall not be opened until the temperature of the coolant drops below 50
°C
. Otherwise, the
hot coolant or steam may cause personal injury.
Radiator cover
Radiator
Lowest water
level
Highest
water level
Balance tank
Summary of Contents for U27
Page 1: ...U27Hydraulic Excavator Instruction Manual Guangxi Yuchai Heavy Industry Co Ltd...
Page 5: ...1 1 Preface...
Page 17: ...2 1 Safety regulations...
Page 44: ...3 1 Parts introduction...
Page 49: ...3 6 Panel meter Oil level pointer Timing display Water temperature pointer Indicator area...
Page 55: ...4 1 Operation guide...
Page 89: ...5 1 Maintenance...
Page 130: ...6 1 Accessories guide...