JLG 450A_AJ Series II Service Manual - Manual (Page 83)

SECTION 3 - CHASSIS & TURNTABLE
3121290 – JLG Lift – 3-43
3.8 SWING MOTOR
IF HYDRAULIC SYSTEM FLUID BECOMES OVERHEATED [IN EXCESS OF 200°F
(93.3°C)], SEALS CAN SHRINK, HARDEN, OR CRACK AND LOSE THEIR SEALING
ABILITY.
Preparation Before Disassembly
PETROLEUM-BASE SOLVENTS ARE FLAMMABLE. BE EXTREMELY CAREFUL
WHEN USING ANY SOLVENT. EVEN A SMALL EXPLOSION OR FIRE COULD CAUSE
INJURY OR DEATH.
WEAR EYE PROTECTION AND COMPLY WITH OSHA OR OTHER MAXIMUM AIR
PRESSURE REQUIREMENTS.
NEVER STEAM OR PRESSURE WASH HYDRAULIC COMPONENTS. DO NOT FORCE OR
ABUSE CLOSELY FITTED PARTS.
• Before you disassemble motor or any of its components
read this entire section. It provides important information
on parts and procedures to service motor.
• Before disconnecting and removing motor, thoroughly
clean off all outside dirt, especially from around fittings
and hose connections. Remove rust or corrosion from cou-
pling shaft.
• Remove coupling shaft connections and hose fittings and
immediately plug port holes and fluid lines.
• Remove motor from system, drain fluid, and move it to a
clean work surface.
• Clean and dry motor before disassembly.
• Keep parts separate to avoid nicks and burrs.
• Discard all seals and seal rings as they are removed from
motor. Replace all seals, seal rings and damaged or worn
parts with OEM approved service parts.
• Clean all parts except seals in clean petroleum-based sol-
vent. Dry with compressed air.
Figure 3-39. Swing Motor - Cutaway
Coupling Shaft
Outer Shaft Seal
Bearing
Housing
Matched Rotor Set
End Cover
Matched Commutator Set
Manifold
Drive Link - 12 Tooth Splines
Wear Plate