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PERFORMANCE CRITERIA
SERVICE DATA
Methods for inspecting performance
Hydraulic oil pressure (Main relief valve set pres-
sure)
Boom, Arm, Dozer Blade
Measuring Method
• Engine: Maximum R. P. M.
• Hydraulic oil temp.: 50~60°C
• Mount the pressure gauge on the pressure detection
port, operate the desired hydraulic circuit and measure
the relief pressure.
Adjusting method
1. Loosen the locknut (2), and turn the setscrew (1) to
adjust the set pressure.
• To increase the set pressure, turn the setscrew
clockwise.
• To decrease the set pressure, turn the setscrew
counterclockwise.
2. Upon completion of the adjustment, tighten the lock
nut (2) by holding the setscrew (1) to prevent it from
turning.
3. Operate the relief valve again to confirm that the newly
set pressure is stabilized.
Circuit Relief valve
Pressure detection port
Port location Size
Boom R1 P1
G1/4Arm R2 P2
Blade R3 P3
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