Nortrac XT20 Owner's Manual page 45

2.16.1.6 Hydraulic Suspension System Faults and Troubleshooting
Sequence
Fault
No.
Cannot lift
1
the load.
Lift should
be in light
2
load or is
slow in
heavy load.
Farm
machine
3 shakes or
lifts
slowly.
Implement
slowly
drops after
4 being lifted
and after
turning off
the engine.
When the
5
handle is in
Operation Description
Table 2-9 Hydraulic Suspension System Faults and Troubleshooting
Fault Reasons
(1) Oil level inside the lifter is low.
(2) The strainer of the oil filter is
blocked.
(3) Air getting in the suction pipe.
(4) Gear oil pump failure.
(5) The spring
outside/inside end of the operation
handle dropped.
(6) The swing rod inside the 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 loose, making it unable to
open the lowering valve.
(11) Oilway from the cylinder end to the
oil cylinder is closed.
(1) The oil suction line sucks air or air
enters the line.
(2) The adjustment pressure for the
system safety valve is too low.
(3) The adjustment pressure for 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 blocked.
(2) Air getting into the suction pipe.
(3) Gear oil pump failure.
(4) Hydraulic oil level is too low.
(1) The tightness of the check valve of
the distributor is poor.
(2) The lowering valve is loose.
(3) The oil cylinder safety valve is
leaking or improperly adjusted.
(4) O-ring for the oil cylinder is
damaged or leaking.
(5) The seal ring
distributor or the cylinder end and
the lifter case
installed, peeled or damaged.
(1) Because of improper adjustment,
the inner lifting arm props against
(1) Add oil to the specified oil level
(2) Clean or replace the strainer of oil
filter
(3) Check for leaks
(4) Replace gear oil pump
pin on the (5) Refit spring pin
(6) Open distributor, and fit swing rod
(7) Dismantle distributor, and clean
valves
(8) Clean main control valve
(9) Clean lowering valve
(10) Remove plug for lowering valve,
readjust the gap of lowering valve
push pin or tighten lowering valve
assembly
(11) Open the oil way
(1) Check the oil suction line and oil
filter.
(2) Replace the system safety valve.
(3) Replace oil cylinder safety valve.
(4) Replace the gear oil pump.
(5) Replace the oil cylinder seal ring.
(1) Replace the filter element.
(2) Replace the O-seal ring.
(3) Replace the gear oil pump.
(4) Add lube oil according to the
requirements.
(1) Clean the check valve.
(2) Clean the lowering valve.
(3) Readjust the oil cylinder safety
valve.
(4) Replace the O-ring.
(5) Replace the seal ring.
between the
is improperly
(1) First measure the lifting height of
implement, then readjust. Shorten
39
Troubleshooting