U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-52
7. Mounting the hex socket lock screw
Secure the hex socket lock screw (60) and the
hex nut (61) to achieve the same length as
before disassembly.
(Wrench “13”, hex wrench “4”)
8. Mounting the gear pump
Assemble the collar (67), coupling (66) and
O-rings (71) and (72) to the gear pump joint of
the piston pump kit, and mount the gear pump
with the two M8x20 hex bolts (68) and the
polished washer (70).
(Closed wrench “13”)
Tightening torque: 1.0 ~ 1.4 kgf·m
9. Checking after assembly
The above completes the reassembly work.
Turn the shaft and check to see if it turns
smoothly.
[5]Troubleshooting of pump
Trouble Cause Remedy
1. Engine is overloaded. (1) Engine rpm higher than
specified.
(2) Pressure higher than
specified.
(3) Pump internal parts seized or
broken.
(1) Readjust as specified.
(2) Readjust as specified.
(3) Repair or replace the pump.
2. Pump oil amount drops
extremely. Discharge
pressure does not rise.
(1) Engine rpm drop.
(2) Pump mounting coupling
defective.
(3) Pump internal parts seized or
broken.
(1) Readjust the rpm.
(2) Repair or replace the pump
coupling.
(3) Repair or replace the pump.
3. Unusual noise or vibrations
(Cavitation)
(1) Air or water mixed in hydraulic
oil.
(2) Suction strainer clogged.
(3) Suction pipe clogged or
choked.
(4) Attached pump in trouble (if it
is attached.)
(5) Caulking of piston shoe
broken.
(6) Pump mount loose.
(7) Coupling defective.
(1) Repair the circuit. Retighten
the suction pipe in particular.
Replace if mixed with water.
(2) Wash or replace the suction
strainer.
(3) Repair the suction pipe.
(4) Repair or replace the attached
pump.
(5) Replace the piston assembly.
(6) Mount the pump firmly.
(7) Replace the coupling.
4. Oil leak (1) O-ring or seat packing
defective.
(2) Cap ring in poor contact.
(3) Oil leak from oil seal edge.
(1) Replace the O-ring or seat
packing. (Fit it correctly.)
(2) Retighten to the specified
torque.
(3) Replace or repair the oil seal
and shaft.
To Next Page
Need help?
General
