Shibaura ST460, Operator'S Manual, Page: 56 / 126

SECTION 2 – OPERATION
2-31
POSITION CONTROL ADJUSTMENT
Linkage Adjustments
The length of the position control rod is critical
and careful adjustment must be observed for
proper operation. If the control rod is adjusted
too short, the control valve spool will remain in
the raised position when the lift arms have
reached their maximum height and the system
relief valve will open to relieve hydraulic pressure.
If the control rod is too long, the control valve
spool will return to neutral before the lift arms
reach their full height.
The position control rod should be adjusted any
time the link is disconnected for service to the
hydraulic system, or any time the relief valve
operation is noticed while the lift arms are at the
full raise position.
Adjustment Procedure
1. Loosen the locknut
①
on the position control
rod ② and remove the pin ③ from the link.
2. Set the control lever
④
to the highest
position.
3. Start the engine. The lift arms ⑤ should
raise and the relief valve should operate.
4. Move the control lever down until the relief
valve ceases operation.
5. Adjust the length of the position control rod
and clevis to align the pin holes. Then
lengthen the rod one additional turn and
install the pin. Tighten the locknut.
6. Check the operation. The relief valve should
not operate when the lift arms are in the fully
raised position.