1900 SRM 964 Relief Valve Adjustment
Relief Valve Adjustment
RELIEF VALVE PRESSURE CHECK
WARNING
DO NOT make rep
airs or adjustments unless
you have been
properly trained and authorized
to do so. Impr
oper repairs and adjustments
can create da
ngerous operating conditions.
DO NOT operat
e a lift truck that needs re-
pair. Report
the problem to your supervisor
immediatel
y. If repairs are necessary, turn the
key switch t
o the OFF position, attach a DO
NOT OPERATE
tagtothecontrolhandle,and
disconnect
the battery.
Always wear
the proper protective equipment
including e
ye protection and petroleum resis-
tant glove
s when servicing hydraulic compo-
nents. Tho
roughly wash oil from exposed ar-
eas of skin
as soon as possible.
Completel
y lower forks to relieve hydraulic
pressure b
efore disassembling any part of the
lift pump
or disconnecting any hoses.
The hydra
ulic oil is hot at normal operating
temperat
ures. Be careful when draining the
oil.
Never che
ck for leaks by putting hands on
hydrauli
c lines or components under pressure.
Hydrauli
c oil under pressure can be injected
into the
skin.
CAUTION
DO NOT OVERFILL RESERVOIR. Oil will leak
from the breather/filler cap during operation if
reservoir is over filled.
NOTE: Check the hydraulic oil level in the reservoir
when oil is at room temperature. Remove breather
cap and add recommended hydraulic oil to proper
level, as required. See Hydraulic Reservoir, Table 1.
1. Operate lift truck until hydraulic oil reaches op-
erating temperature [43 to 49
C(110to120F)].
2. Lower the forks completely to relieve pressure
from hydraulic circuit.
3. Turn the key switch to the OFF position and dis-
connect the battery.
4. Block load wheels to prevent lift truck from
moving. Refer to the section Periodic Mainte-
nance 8000 SRM 919, Periodic Maintenance
8000 SRM 1032, Periodic Maintenance 8000
SRM 1368, or Periodic Maintenance 8000
SRM 1298 - How to Put A Lift Truck on Blocks.
5. Remove the drive unit compartment covers. See
Drive Unit Compartment Covers.
6. Discharge the capacitor. See Special Precau-
tions.
7. Clean any buildup of dirt from around the lift
pump and motor assembly.
CAUTION
Protect the hydraulic system from dirt and
contaminants when servicing the hydraulic
system.
8. Disconnect the hydraulic hose at the pump.
9. Install a tee fitting and a pressure gauge of at
least 24.8 MPa (3600 psi).
10. Verify the oil is at an operating temperature of
43 to 49
C(110to120F).
11. Raise the forks completely and continue to hold
the lift button. Read the pressure gauge while
the pump is in relief. See Table 2 for correct pres-
sures.
NOTE: Thepumpwillstopafterashortperiodof
time. Release the lower button then press and hold
again to continue.
12. If the relief pressure is incorrect refer to Adjust
Relief Valve Pressure.
Table 2. Relief Valve Settings
Model Relief S
etting*
B60Z, B60Z
AC
, C60Z,
C60Z
AC
,andW60Z
18.96 MPa
(2750 psi)
B80Z, B80Z
AC
, C80Z,
C80Z
AC
, W65Z, and W80Z
24.2 MPa
(3500 psi)
*+0.6 0.0 MPa (+87 0psi)@21C(70F)
Oil Temperature
23
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