IHI 9NX - Main Relief Valve Pressure Measuring and Adjusting Procedure

3. Main Relief Valve Pressure Measuring and Adjuting Procedure
Note
[-I
Do not remove the gauge port plug until
air pressure has been relieved in
hydraulic tank and engine off.
Main relief valves
1
P
Control valve Ass'y
Conditions
Measuring
procedures
Procedures
1. Engine speed
: Maximum revolution
2. Hyd. oil Temp.
: 45 to 55°C
3. lnstall of pressure gauge : lnstall the
pressure gauge (300
kgf/cm2) to
gauge ports
PI, P2 or P3 on the
control valve.
1. Stop the engine. Remove the oil fill
plug on the hydraulic tank. Remove
the cover and install the pressure
gauge to measure port on the control
valve. lnstall the fill plug.
2. Measure the MRI Main relief valve
(Operation for Boom, Bucket, Travel
R.H. and Service)
(1) Start the engine, move the bucket
or boom cylinder fully stroked.
(2) Move the engine throttle lever to
high idle. Move the bucket or
boom lever fully stroke to hold it,
and measure the pressure.
3. Measure the MR2 Main relief valve
(Operation for Arm, Travel
L.H. and
Service)
(1) Start the engine, move the arm
cylinder fully stroked. (extend or
retract)
(2) Move the engine throttle lever
tohigh idle. Move the arm lever
fully stroke to hold
it, and measure
the pressure.
5. Remove the pressure gauge. Apply
pipe sealant to the plug. lnstall the
fill
plug on the hydraulic tank. lnstall the
cover.