JLG 740A, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-76 – JLG Lift – 3121160
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 5 mm (0.187 in.) hex key
through port opening and push it out. The 009 plug
is not interchangeable with 007 and 008 plugs.
Inspection and Cleaning
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 the 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 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 reassembling motor.
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 follow:
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 with solvent to remove oil,
grease and debris. Pay particular attention to
four tapped holes on flanged end.
b. Blow dry with compressed air. Clean and dry
tapped holes.
c. Wire brush screw threads to remove cured Loc-
tite and other debris. Discard any screws that
have damaged threads or rounded heads.
d. Wash screws with non-petroleum base solvent.
Blow dry with compressed air.
Assembly
SHAFT END
1. If you remove plug and seal, lubricate seal and
install on plug. Some plugs have two o-ring grooves
but require only one o-ring. Install o-ring in groove
closest to end of plug. Push plug into housing. Be
careful not to damage seal.