HYDRAULIC SYSTEM
M6040, M7040, WSM
8-S29
Installing Piston Seal
1. Place the slide jig (2) on the piston (3).
2. Install the piston seal (1) to the piston using the slide jig. (See
page G-73.)
3. Compress the piston seal to the correct size by installing the
piston into the correcting jig (5).
• Do not turn (roll) the piston seal as you install it.
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[6] RELIEF VALVE
Disassembling Relief Valve
1. Remove the relief valve assembly (1).
2. Secure the relief valve assembly (1) in a vise.
3. Loosen the lock nut (10).
4. Remove the adjuster (9), and remove the spring (8) and then
pilot valve (7).
5. Remove the valve seat (2), and draw out the valve seat (5), the
spring (4) and the main valve (3).
(When reassembling)
• Take care not to damage the O-ring.
• After disassembling and assembling the relief valve, be
sure to adjust the relief valve setting pressure.
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(1) Piston Seal
(2) Slide Jig
(3) Piston
(4) Bearing Ring
(5) Correcting Jig
Tightening torque Relief valve
34.3 to 39.2 N·m
3.5 to 4.0 kgf·m
25.3 to 28.9 lbf·ft
(1) Relief Valve
(2) Valve Seat
(3) Main Valve
(4) Spring
(5) Valve Seat
(6) Valve Body
(7) Pilot Valve
(8) Spring
(9) Adjuster
(10) Lock Nut
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