Nortrac 35XT Owner's Manual page 52

5. Steering is slow to
respond or hard to turn.
2.16.1.6 Hydraulic Hitch System Faults and Troubleshooting
Table 2-7 Hydraulic Hitch System Faults and Troubleshooting
Fault
1. Unable to lift either a
light or heavy load.
2. Light load can be lifted,
but heavy load cannot be
lifted or lifts slowly.
3. Farm implements shake
during lifting and/or lift
slowly.
Maintenance Instructions
(1) The clearance between the valve core and
the valve housing is too large.
(2) The clearance between the interlocking shaft
and the fork pin is too large.
(3) The clearance between the interlocking shaft
and the rotor is too large.
(4) The return spring is broken or too soft.
Causes
(1) The oil level within the 3-point lift
is too low.
(2) The strainer of 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
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) 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) Oil filter is blocked.
(2) Air getting into the oil suction
pipe.
46
(1) Replace valve.
(2) Replace shaft or pin.
(3) Replace shaft or rotor.
(4) Replace.spring.
(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.
inside the (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.
(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.
(1) Replace the filter element.
(2) Replace the O-ring seal.
(3) Replace the gear oil pump.
Troubleshooting