Kubota WSM STa-30, Workshop Manual

Page: 305 / 359

9-S8
ST
α
-30 · ST
α
-35, WSM HYDRAULIC SYSTEM
Relief Valve Setting Pressure Test Using Pressure Tester
1. Start the engine and move the position control lever to the
maximum raising position.
2. Turn the position control rod adjusting nut and lock nut until the
relief valve begins to be operated. (Refer to 9-S7 Adjusting
Control Rod)
3. Move the position control lever to the lowest position and stop the
engine.
4. Remove the plug of hydraulic cylinder cover and install the
adaptor 7 (Code No.: 07916-32951). Then connect the cable
(Code No.: 07916-50331) and pressure gauge (Code No.:
07916-50322) to adaptor 7.
5. Start the engine and set the engine speed at maximum.
6. Move the position control lever to the maximum raising position
and read the pressure when the relief valve functions.
7. Stop the engine.
8. If the pressure is not within the factory specification, remove the
plug (1) and adjust with adjusting shims (2).
9. After the relief valve setting pressure test, adjust the position
control rod. (See page 9-S7.)
Condition
• Engine speed .......... Maximum
• Oil temperature ....... 45 to 55 °C
113 to 131 °F
(Reference)
• Thickness of shim (2) :
0.1 mm (0.0039 in.) 0.2 mm (0.0078 in.) 0.4 mm (0.0157 in.)
• Pressure change per 0.1 mm (0.0039 in.) shim :
approx. 264.8 kPa
2.7 kgf/cm
2
38.4 psi
W1012920
Adjusting Position Control Lever Operating Force
1. Set a spring balance to the position control lever to measure the
operating force.
2. If the measurement is not within the factory specification, loosen
the lock nut (1) and adjust the operating force with position
control lever mounting nut (2).
(When reassembling)
• Be sure to tight the lock nut.
W1013299
Relief valve setting
pressure
Factory spec.
16.7 to 17.2 MPa
165 to 175 kgf/cm
2
2346.8 to 2489.0 psi
(1) Plug (2) Shim
Position control lever
operating force
Factory spec.
25 to 34 N
2.5 to 3.5 kgf
5.5 to 7.7 lbs
(1) Lock Nut (2) Mounting Nut
KiSC issued 11, 2006 A