WEICHAI WD10 Service Manual - page 143
Service Manual for WD10 Diesel Engine
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2) Before assembling the compressor, turn over the compressor all around for 2~3 times, so that
lubricating oil in the compressor can be evenly distributed. After assembling compressor and its
pipelines, rotate the compressor by hand for 10 circles at least.
3) If necessary, clean the system when replacing the compressor, replace the reservoir, expansion
valve or gas-liquid separator and throttle pipe at the same time.
4) The compressor is sealed with 0.06~0.10MPa dry nitrogen, so be careful when removing
compressor intake and exhaust sealing plugs. After removing compressor intake and exhaust
sealing plugs, connect the compressor to refrigerating system immediately, and also vacuum
the system to prevent moisture in the air absorbed by lubricating oil.
5) Apply a small amount of lubricating oil on the seal rings of compressor intake and exhaust
pipelines before assembling.
6) Fixing bolts of compressor intake and exhaust pipes must be of high strength, refer to Table 4-4
for tightening torques.
Table 4-4 Bolt tightening torque
Thread specification
Tightening torque (Nm)
M16×1
10~12
M8×1
20~25
M8×1.25
25~30
M10×1.25
40~50
7) When assembling the compressor, the bolts should be evenly tightened, keep pulley shaft and
engine shaft in parallel, and the belt should be in the same plane. Adjust the belt tension, it is
suitable if the belt is depressed 10~14mm after loading 10kg force.
8) Freezing lubricating oil of different brands cannot be mixed, otherwise normal operation of
A/C compressor cannot be guaranteed.
9) Slow down the refrigerant draining process, to prevent freezing lubricating oil spraying along
with the refrigerant.
10) Fill lubricating oil through the intake port or oil drain bolt.
11) Avoid direct solar exposure when parking in summer, in order to prevent burdening the A/C.
For start the machine after solar exposure, firstly you should open the window to dissipate the
heat, close the window and turn on the A/C 1 minute later.
12) To avoid the accumulated sundries and dirt on condenser affecting the cooling performance,
clean the condenser with water if it is dirty.
13) ATTENTION: When cleaning the condenser, do not crash and deform the fins, straighten the