5-50 5 OIL CONTROL VALVE
5.3 RELIEF PRESSURE ADJUSTMENT
NOTICE
• Relief pressure adjustment for tilt side is "Not" necessary by adopting Electromagnetic relief valve while
relief valve is dual structure type as before.
• Always adjust the relief pressure as described below. Avoid hasty adjustment since it may cause high-
pressure generation that may result in damage to the oil pump and other hydraulic devices.
• Before starting adjustment, check if the no-load maximum rpm is as specified.
1. Open the engine hood.
2. Remove the lower panel and toe board.
3. Install an oil pressure gauge.
Remove the oil-pressure detecting plug installed on
the left side of the oil control valve, and install the oil
pressure gauge there.
Plug size: 9/16-18UNF
Fitting size: 9/16-18UNF × PF1/4
Fitting: 90407-13469-71
a
Adjusting screw A
Lock nut 1
Adjusting
sleeve B
Lock nut 2
4. Set the adjusting sleeve B of the lift relief valve as de-
scribed below.
Loosen lock nut 2, and position adjusting sleeve B to
the following dimension.
a = 27.0 mm (1.06 in)
NOTICE:
â–ª Do not loosen the adjusting screw A and the
lock nut 1 for tilt relief pressure adjustment
because the adjustment is not necessary.
b
Adjusting screw A
Adjusting
sleeve B
â–ª If loosening, perform the position adjustment
for the adjusting screw A as the following loc-
ation and lock by the lock nut 1.
Reference: b = 11.4 mm (0.449 in)
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