wsm M108S - Three-Point Hitch System (Relief Valve and Safety Valve) Operating System

8-S6
M108S, WSM
HYDRAULIC SYSTEM
(2) Three-Point Hitch System (Relief Valve and Safety Valve) Operating System
Relief Valve Setting Pressure Test Using Pressure Tester
(Coupler)
1. Set the relief valve set pressure adaptor G (Code No. 07916-
52751) to the half male of the quick coupler and then set a
pressure gauge (Code No. 07916-50321), cable (Code No.
07916-50331).
2. Start the engine, set at maximum speed.
3. Set the auxiliary control valve operation lever to the UP position
and read the pressure gauge when the relief valve is actuated.
4. If the pressure is not within the factory specification, adjust the
relief valve adjustor (3).
Condition
• Engine speed ............ Maximum
• Oil temperature ......... 45 to 55 °C
113 to 131 °F
W1027885
Safety Valve Setting Pressure Test Using Injection Nozzle
Tester
1. Remove the cylinder safety valve assembly (1).
2. Attach the cylinder safety valve to an injection nozzle tester with
a safety valve setting adaptor. (Refer to “8. SPECIAL TOOLS”
at “G. GENERAL” section.)
3. Measure the operating pressure of the cylinder safety valve.
4. If the operating pressure is not within the factory specifications,
adjust by turning the adjusting screw (2).
5. After adjustment, tighten the lock nut (3) firmly.
(When reassembling)
• Install the cylinder safety valve to the hydraulic cylinder block,
taking care not to damage the O-ring.
NOTEQ
• Use specified transmission fluid (refer to “4. LUBRICANTS,
FUEL AND COOLANT” at “G. GENERAL” section) to test
the operating pressure of the cylinder safety valve.
W1028474
Relief valve setting
pressure
Factory spec.
19.2 to 19.6 MPa
195 to 200 kgf/cm
2
2780 to 2840 psi
(1) Relief Valve
(2) Lock Nut
(3) Adjustor
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
Cylinder safety valve
operating pressure
Factory spec.
23.1 to 24.5 MPa
235 to 250 kgf/cm
2
3350 to 3550 psi
(1) Safety Valve Assembly
(2) Adjusting Screw
(3) Lock Nut
(4) O-ring
(5) Seat
(6) Spring
(7) Ball
(8) Housing
KiSC issued 05, 2012 A