MAINTENANCE 9VX3
Procedures Note
Adjusting the Main relief valve
Adjusting If the pressure is lower than the
procedures specified value, adjust it according to
the following procedure.
(Same procedures as MR1, MR2)
1. Remove the lock nut.
2 . Start the engine and the engine throttle
lever to high idle.
3. Move the lever for measuring main
relief valve, fully pull to hold it, and
adjust the pressure by turning the
adjusting screw with a hexagon bar
spanner, while measuring the pressure.
Adjusting screw turn to clockwise to
raise the pressure. (Adjusting screw 1
turn approx. 9.8 MPa change pressure)
4. Install and tighten the lock nut.
5. After locking, measure the pressure
again.
6 . Stop the engine. Remove the fill plug
on the hydraulic tank.
7. Remove the pressure gauge. Apply
pipe sealant to the plug. Install the
plug. Install the fill plug on the hydraulic
tank.
A WARNING
Do not remove the gauge port plug until air
pressure has been relieved in hydraulic
tank.
MR2 MR1
^ || '£/| \
P1
Gauge ports
Control valve Ass’v
Adjusting
Main valve screw
4-13-3
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