Agrison TX930LX - Unstable Minimum No-load Steady Speed (Idle Speed)

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(II) Unstable Minimum No-load Steady Speed (Idle Speed)
Fault Characteristics & Causes
Elimination Approaches
1. The minimum no-load steady speed (idle speed)
is low.
1. Go to Agrison technical service station to
check fuel system.
2. High-speed and idle-speed accelerator handle
have wrong positions.
2. Adjust the positions of the accelerator handles.
3. The handle is bent or has loose connection.
3. Tighten or replace the handle.
4. Air is entrained in oil passage.
4. Exhaust the air.
5. Nut connecting injection pump and diesel
engine is loose.
5. Tighten the connecting nut.
6. High-speed and idle-speed accelerator handle
have wrong positions.
6. Adjust the positions of the accelerator handles.
7. Valve clearance is too large.
7. Adjust the valve clearance.
8. Cylinder pressure is insufficient.
a) Valve clearance is too small.
b) Air leaks from valve.
c) Air leaks from junction of cylinder head and
gasket.
d) Piston ring is worn, coked or the openings are
overlapped.
e) Abrasions of cylinder liner and piston exceed
a) Adjust the valve clearance to specified value；
b) In case of reduced elasticity of the valve
spring, replace the valve spring; in case of bad
sealing performance of the taper surface, polish
the valve；
c) Replace the head gasket；
d) Replace the piston ring and adjust the opening