Dingsheng Tiangong PY180H, Operating Manual

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supply system.
d. Spring of delivery valve is
broken.
2. Nonuniform output of oil.
a. There existing air in oil
supply system.
b. Spring of delivery valve is
broken.
c. Sealing surface of delivery
valve and external circular
face are worn.
d. Plunger pair is worn or
spring is broken.
e. Foreign matters block
plunger pair.
f. Oil input pressure is too
low.
3. Oil supply is insufficient
a. Delivery valve leaks oil.
b. Joint leaks oil.
c. Plunger is worn.
Replace spring.
Drain air.
Replace spring.
Replace parts or repair.
Replace parts.
Clean.
Check oil transfer pump or filter.
Repair or replace parts.
Check and repair.
Replace parts.
1.11 Fault in fuel
injector 1. Decrease in oil injection or
cannot inject oil.
a. There existing air in oil
circuit.
b. Needle valve and valve
body are snapped.
c. Needle valve and valve
body are matched too loosely.
d. Oil supply system leaks oil
seriously.
e. Oil supply of injection
pump is irregular.
2. Low injection pressure
a. Adjusting screw is loose.
b. Camber of spring
3. High injection pressure
a. Needle valve with needle
valve.
b. Oil hole is blocked.
c. Pressure of pressure
regulating spring is too high.
4. Seriously leaks oil
a. Pressure regulating spring is
Drain air.
Repair or replace.
Replace.
Tighten joint or replace parts.
Readjust injection pump on test
bed.
Adjust to specified pressure.
Replace spring.
Repair.
Clean.
Readjust.
Replace spring.
Repair or replace parts.