34 - 15
Main Relief Valve
Dismantling
1 Secure adjusting screw 1 and housing 10.
2 Slacken locknut 2.
3 Secure relief valve body 4.
4 Slacken locknut 3.
5 Slacken relief valve body 4 and remove assembly from
main control valve housing.
6 Remove O’-ring 5 and discard.
7 Withdraw outer sleeve 6 from main control valve
housing.
8 Remove sleeve 7.
9 Remove spring 8.
Note: Pilot seat 9 is press fitted into the relief valve body 4.
Do not attempt to remove it.
10 Remove adjusting screw 1 with locknut 2 from housing
10.
11 Remove ‘O’-ring 11 and discard.
12 Remove adjustment screw housing 10 with locknut 3
from relief valve body 4.
13 Remove spring seat 12, spring 13 and poppet 14 from
housing 10.
Cleaning, Inspection
1 Clean all components in clean oil and dry with
compressed air.
2 Check that the seat surfaces on the end of the poppet
14 and seating 9 are defect free and contact surfaces
are uniform.
3 Check that the poppet sleeve 7 and outer sleeve 6
move smoothly and freely.
4 Check springs 8 and 13 have no defects, deformation
or wear.
5 Check that there is no foreign matter blocking orifices in
the main poppet or pilot seat.
6 Remove any minor defects by lapping.
7 Renew the relief valve if any damaged or badly worn
parts are found.
Section E Hydraulics
9803/6410
Section E
34 - 15
Issue 1
Control Valve
JS01270
JS01280
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