IHI 9VX3 - Page 127

MAINTENANCE 9VX3
Procedures Note
Adjusting the over load relief valve
Adjusting If the pressure is lower than the
procedures specified value, adjust it according to
the following procedure.
(Same procedures for OR1 thru OR3)
1. Remove the lock nut.
2. Adjust the pressure by turning the
adjusting screw with a hexagon bar
spanner. 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 . Lower the bucket to the ground. Stop
the engine. Remove the fill plug on the
hydraulic tank.
7. Remove the pressure gauge and hose
adapter. Install the arm IN line hose to
tube. Install the fill plug on the hydraulic
tank.
A WARNING
Do not remove the over load relief valve
until air pressure has been relieved in
hydraulic tank and lowered the bucket to
the ground.
OR2
Boom Lower
Overload V
\
:-4:"
73
t cn \L >
k''v;
» ^
\
OR3
Arm Hoist
Overload V
/
OR1
Boom Hoist
Overload V
Main valve Adjusting
Cross section of
over load relief valve Ass’v
4-13-5