9. Examine the relief valve faces, and the seats in
the body. The faces of the relief valve and the seats
in the body should be free of burns and defects.
10. Remove two neutral valves from body. Clean the
valves in a suitable solvent and check for damage or
12. Inspect ball bearing. The bearing should spin
freely.If replacement is necessary, press bearing out
from the outer side of body.
13. Inspect oil seal. If replacement is necessary,
replace it.
IMPORTANT : To avoid damage to bearings ,
when removing or installing, press only against
side of bearing with lettering.
When removing bearings from body, be extremely
careful not to damage machined surfaces
Note : The relief valve is dual purpose valve. The
valve contains two springs. A weak spring in the
plug(check valve when other circuit is in use) and a
strong spring (34MPa relief valve). The relief valve
can not be adjusted, and there is no serviceable part
inside. If any malfunction is suspected, replace the
relief valve.
4-22
in spool Two neutral valves are interchangeable, but
it is recommended that the valves go into original
holes during assembly.
Housing Disassembly
IMPORTANT:
The HST housing is aluminum material and can be
easily damaged by steel tools. Be careful not to
damage machined surfaces. Do not use screw driver
or other sharp objects.
11. Inspect needle bearings. The bearing should spin
freely and needles should not fall out of bearing
cage. If replacement is necessary, press bearing
out from the outer side of body.
Pump part Motor part
Spring for charge relief valve
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