Kubota M108S, Workshop Manual

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8-S13
M108S, WSM HYDRAULIC SYSTEM
(2) Relief Valve for Three-Point Hitch
Relief Valve
1. Remove the lock nut (9).
2. Remove the adjuster (8), and draw out the spring (7) and pilot
valve (6).
3. Remove the valve seat (1), and draw out the valve seat (4), the
spring (3) and the main valve (2).
(When reassembling)
• Take care not to damage the O-rings.
IMPORTANT
■
• After disassembling and assembling the relief valve, be sure
to adjust the relief valve setting pressure. (Refer to “[1]
CHECKING AND ADJUSTING” in this section.)
W1038643
(3) Safety Valve for Three-Point Hitch
Cylinder Safety Valve
1. Remove the cylinder safety valve assembly (8).
2. Secure the cylinder safety valve assembly in a vise.
3. Loosen the lock nut (2), and remove the adjusting screw (1).
4. Draw out the spring (3), seat (4), and ball (5).
(When reassembling)
• Install the cylinder safety valve to the hydraulic cylinder block,
taking care not to damage the O-ring.
• Be sure to adjust the operating pressure of cylinder safety valve
after assembling. (Refer to “[1] CHECKING AND ADJUSTING”
in this section.)
W1039018
Tightening torque Relief valve
35 to 39 N·m
3.5 to 4.0 kgf·m
26 to 28 lbf·ft
(1) Valve Seat
(2) Main Valve
(3) Spring
(4) Valve Seat
(5) Valve Body (6) Pilot Valve
(7) Spring
(8) Adjuster
(9) Lock Nut
(10) Relief Valve
Tightening torque
Cylinder safety valve
assembly
40 to 49 N·m
4.0 to 5.0 kgf·m
29 to 36 lbf·ft
Cylinder safety valve lock
nut
59 to 78 N·m
6.0 to 8.0 kgf·m
44 to 57 lbf·ft
(1) Adjusting Screw
(2) Lock Nut
(3) Spring
(4) Seat (5) Ball
(6) Housing
(7) O-ring
(8) Safety Valve Assembly
KiSC issued 06, 2007 A