HYDRAULIC SYSTEM
M6040, M7040, WSM
8-S8
Safety Valve Setting Pressure Test Using Injection Nozzle
Tester
1. Remove the safety valve assembly (1).
2. Attach the safety valve to an injection nozzle tester with a safety
valve setting adaptor (see page G-74).
3. Measure the operating pressure of the 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 safety valve to the hydraulic cylinder block, taking
care not to damage the O-ring and apply transmission fluid.
• Use specified transmission fluid (see page G-10) to test the
operating pressure of the cylinder safety valve.
9Y1210143HYS0006US0
Tightening torque
Safety valve assembly
39.2 to 49.0 N·m
4.0 to 5.0 kgf·m
28.9 to 36.2 lbf·ft
Safety valve lock nut
58.8 to 78.5 N·m
6.0 to 8.0 kgf·m
43.4 to 57.9 lbf·ft
Safety valve operating
pressure
Factory specification
23.1 to 24.5 MPa
235 to 250 kgf/cm
2
3342 to 3556 psi
(1) Safety Valve Assembly
(2) Adjusting Screw
(3) Lock Nut
(4) Spring
(5) Seat
(6) Ball
(7) Housing
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