Oshkosh JLG 400S, Service And Maintenance Manual

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SECTION 5 - HYDRAULICS
5-20 – JLG Lift – 3120895
SOME MOTORS MAY HAVE A QUAD SEAL AND BACK - UP RING
IN PLACE OF THE PRESSURE SEAL. THE QUAD SEAL AND BACK -
UP RING ARE NO LONGER AVAILABLE AND ARE REPLACED BY
THE PRESSURE SEAL. THEY ARE INTERCHANGEABLE, BUT SOME
PRECAUTIONS MUST BE TAKEN TO INSURE PROPER INSTALLA-
TION. FOLLOW THE REASSEMBLY INSTRUCTIONS.
16. Exclusion seal, back -up ring, pressure seal and seal
will come off with flange. Use seal removal tool, to
remove exclusion and pressure seals.
BE CAREFUL NOT TO SCRATCH SEAL CAVITY O.D. THIS COULD
CREATE A LEAK PATH.
17. A metal plug, with seal, plugs a machining hole in
the housing. It is not necessary to remove plug and
replace seal unless leakage occurs around plug. To
remove plug, insert 3/16 in. (5mm) hex key through
port opening and push it out. The 009 plug is not
interchangeable with 007 and 008 plugs.
Reassembly Shaft End
Check all mating surfaces. Replace any parts with
scratches or burrs that could cause leakage or damage.
Clean all metal parts in clean solvent. Blow dry with air. Do
not wipe parts with cloth or paper towel because lint or
other matter could get into hydraulic system and cause
damage.
Check around key slot and chamfered area of shaft for
burrs, nicks or sharp edges that could damage seals dur-
ing reassembly. Remove nicks or burrs with a hard
smooth stone (such as an Arkansas stone). Do not file or
grind motor parts.
NOTE: Lubricate all seals with petroleum jelly. Use new
seals when reassembly motor. Refer to parts list 6-
121 for proper seal kit numbers.
DO NOT STRETCH SEALS BEFORE INSTALLING THEM.
Cleanliness is extremely important in the successful appli-
cation of Loctite. Before Loctite can be applied, the parts
should be cleaned as follows:
NOTE: Fully cured Loctite resists most solvents, oils, gaso-
line and kerosene and is not affected by cleaning
operations. It is not necessary to remove cured Loc-
tite that is securely bonded in tapped holes; however,
any loose particles of cured Loctite should be
removed.
a. Wash the housing in solvent to remove oils,
grease and debris. Pay particular attention to
four tapped holes on flange end.
b. Blow dry with compressed air. Clean and dry
tapped holes.