jcb ROBOT 150, Service Manual

Page: 173 / 254

10 - 10
Hydrostatic Pump
from machine no. 676355
Charge/Anti-stall Valve
Dismantling and Assembly
1 Mark the plug 1 , locknut 2 and the pump body so as to
approximately maintain the original adjustment.
2 Loosen locknut 2 and unscrew plug 1 from pump body
.
Remove O-ring 3 from plug 1 and discard O-ring.
3 Remove spring 4 and poppet 5 from pump body.
4 Inspect poppet 5 and mating seat in pump body for
damage. Renew as necessary.
5
Install a new O-ring
3
on plug
1
.
6 Fit poppet 5 and spring 4 into pump body.
7 Screw plug 1 complete with locknut 2 into pump body to
align with the marks made during disassembly. Tighten
the locknut.
8 Check the charge pressure and adjust as necessary.
Charge Pressure Checking and Adjustment
1 Stop engine. Connect a 0 - 40 bar (0 - 600 lb/in 2 , 0 - 42
kg/cm 2 ) pressure gauge into test point X situated
underneath the hydraulic filter.
2 Start engine and check pressure is as specified in
Technical Data.
3 If the pressure is not as specified, stop the engine.
Unscrew locknut
2 and turn adjuster Y 4 turn at a time
(clockwise to increase pressure) then re-tighten locknut.
Start engine and re-check pressure. Continue procedure
until pressure is correct then remove pressure gauge.
Section E
Hydraulics
9803/8500
Section E
*10 - 10
Issue 2*
Pumps
S244920
4
3
2
5
1
Y
S249960
X
*