JLG 450A II Series, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-48 – JLG Lift – 3121290
2. Remove rotor set (8) and wearplate (9), together to hold
rotor set in its assembled form, keeping same rotor vane
to stator contact surfaces. Drive link (10) may come away
from coupling shaft (12) with rotor set and wearplate.
Shift rotor set on wearplate and remove drive link if
needed. Inspect assembled rotor set for nicks, scoring,
or spalling on any surface, and for broken or worn
splines. If a rotor set component requires replacement,
complete rotor set must be replaced as it is a matched
set. Inspect wearplate for cracks, brinelling, or scoring.
3. Discard seal ring (4) between rotor set and wearplate.
NOTE:
Rotor set (8) components may become disassembled dur-
ing service. Mark surface of rotor and stator facing UP, with
etching ink or grease pencil before removal to ensure cor-
rect reassembly of rotor into stator and rotor set into
motor. Mark all rotor components and mating spline com-
ponents for exact repositioning at assembly for maximum
wear life and performance of rotor set and motor.
NOTE:
A polished pattern on wear plate from rotor rotation is nor-
mal. Place rotor set (8) and wear plate (9) on a flat surface
and center rotor in stator so two rotor lobes (180 degrees
apart) and a roller vane centerline are on the same stator
centerline. Check rotor lobe to roller vane clearance with a
feeler gage at this common centerline. Replace rotor set If
more than 0.005" (0.13 mm) of clearance.
NOTE:
If rotor set (8) has two stator halves and two sets of seven
vanes as shown, check rotor lobe to roller vane clearance
at both ends of rotor.
4. Remove drive link (10) from coupling shaft (12) if it was
not removed with rotor set and wear plate. Inspect drive
link for cracks and worn or damaged splines. No visible
lash (play) should be seen between mating spline parts.
Remove seal ring (4) from housing (18) and discard.