Operation Description
55
Steering wheel does not
return to neutral position
when steering
(1) Steering cylinder leaks oil
(2) In the neutral position, when the oil
pressure is too high or the steering wheel
stops turning, the steering cylinder will not
return center (neutral)
(3) Steering shaft and hydraulic control valve
core are not aligned
(1) Find and fix oil leak
(2) Repair or replace
steering cylinder
(3) Reassemble and adjust
2.19.7 Hydraulic Hitch System Faults and Troubleshooting
Table 2-10 Hydraulic Hitch System Faults and Troubleshooting
Fault
Causes
Solutions
Unable to lift either a
light or heavy load
(1) Oil level within the 3-point lift is too low
(2) Strainer in the oil filter is blocked
(3) Air is getting into the oil suction line
(4) Gear oil pump failure
(5) Spring pin on the outside/inside end of the
operation handle has fallen out
(6) The swing rod inside the hydraulic
distributor dropped
(7) The main control valve seized at the
middle or lowering position, or the oil return
valve seized in the open position
(8) Main control valve seized
(9) Lowering valve seized
(10) Pin shortened, or lowering valve
assembly comes loose making it unable
to open the lowering valve
(11) The oil passage from the cylinder end to
oil cylinder is closed
(1) Add oil to the specified
oil level
(2) Clean or replace the strainer
on the oil filter
(3) Check for air leaks
(4) Replace the geared oil pump
(5) Reinstall the spring pin
(6) Open the distributor, and
install the swing rod
(7) Take apart the distributor, and
clean each valve
(8) Clean main control valve
(9) Clean lowering valve
(10) Remove plug for lowering
valve, readjust the clearance of the
lowering valve push pin or tighten
the lowering valve assembly
(11) Open the oil passage
Light load can be lifted,
but heavy load cannot be
lifted or lifts slowly
(1) Air is entering the oil suction line
(2) Adjustment pressure of the system safety
valve is too low
(3) Adjustment pressure of the oil cylinder
safety valve is too low
(4) Gear oil pump is worn or pressure
is inadequate
(5) Oil cylinder seal ring is leaking
(1) Check the oil suction pipe and
oil filter
(2) Replace the system
safety valve
(3) Replace the oil cylinder
safety valve
(4) Replace the geared oil pump
(5) Replace the seal ring on the
oil cylinder
Farm implements shake
during lifting and/or
lift slowly
(1) Oil filter is blocked
(2) Air getting into the oil suction pipe
(3) Gear oil pump failure
(4) Hydraulic oil level is too low
(1) Replace the filter element
(2) Replace the O-ring seal
(3) Replace the gear oil pump
(4) Add lubricating oil according
to the requirements