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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 debris in spring or seating area
and burns or defects in spool Two neutral
valves are interchangeable, but it is
recommended that the valves go into original
holes during assembly.
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
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.
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.
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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