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2
PERFORMANCE CRITERIA
SERVICE DATA
Hydraulic oil pressure (Slewing relief valve set pressure)
Measuring method
• Engine: Maximum R. P. M.
• Hydraulic oil temp.: 50~60°C
• Mount the pressure gauge on the pressure detection
port and set a solid obstacle so that the upperstructure
cannot slew in the direction to be measured. Next, op-
erate
the circuit to be measured and measure the relief
pressure.
Adjusting method
It
is not possible to adjust the set pressure with the relief
valve on the slew motor. If adjustment is required, replace
the relief valve assembly.
Hydraulic oil pressure (Pilot pressure)
Measuring method
• Engine: Maximum R. P. M.
• Hydraulic oil temp.: 50~60˚C
• Mount pressure gauge on the pressure detection port
and measure the pilot 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
Right slew R1
P3 G1/4
Left slew R2
Relief valve
Pressure detection port
Port location Size
R4 P4 G1/4
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