Mahindra 2810, Service Manual

Page: 162 / 223

4. MAIN RELIEF VALVE
1)GENERAL DESCRIPTION
This valve regulates the maximum pressure in
the whole hydraulic circuit.The regulated
pressure can be set with the adjust screw.
2) PRECAUTIONS FOR DISASSEMBLY
AND REASSEMBLY
(1)Tightening torque of lock nut (9)5.0
～
6.0
㎏
f·
㎠
(36.2
～
43.4 ft.lbs)
(2)Install seat(2)and then tap ball(3)(5/16)
lightly so as to provide tight seating.
(3)Wrap the valve threads with sealing tape
and tighten the valve up to a specified
torque of 5-6Kgf.m(36-43 ft.lbs)
(4)Before disassembly, the current
screwing-in depth of the adjust screw
should be written down or memorized for
later reference.
3) MEASUREMENT OF THE RELIEF
PRESSURE
(1)3 POINT TO TEST RELIEF PRESSURE
①
Remove the plug in the delivery pipe on
the right-hand side of the transmission
case and install a compression gauge to
measure the pressure.
Keep the engine speed at 2600 rpm and
shift the position control lever at the
highest position.
②
Control valve coupler.
③
Remove the plug in the hyd. pump flange
and engage the pressure gauge and
measure it.
Fig. 9-9 Main Relief valve
Fig 9-10 relief valve circuit.
Measurement the Pressure must be done 3
times and should be set within specified
pressure.
145
±
5
㎏
f·
㎠
Specified relief pressure
9-8