34 - 17
Overload Relief Valve
Dismantling
1 Slacken the valve housing 1 and remove complete from
the control valve body.
Note: Because pressure adjustment is difficult, do not
dismantle the adjusting screw 2 and poppet assembly.
2 Remove ‘O’-ring 3 and discard.
3 Slacken relief valve seat 4 and remove as a sub
assembly.
4 Remove ‘O’-ring 5 and discard.
5 Remove poppet housing sleeve 6, piston 7, poppet 8
and spring 9.
6 Remove ‘O’-rings and seals 10 and 11 and discard.
Cleaning, Inspection
1 Clean all parts in clean oil and dry with compressed air.
Inspect all parts.
2 Ensure piston 7 and poppet sleeve 6 move smoothly.
3 Check spring 9 has no defects, deformation or wear.
4 Remove slight defects by lapping.
5 Renew damaged or badly worn parts.
Assembly
Assembly is the reverse of the dismantling procedure.
Torque Settings
1 39 Nm (29 lbf ft)
4 58 Nm (43 lbf ft)
Section E Hydraulics
9803/6410
Section E
34 - 17
Issue 1
Control Valve
JS01300
JS01320
JS01310
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