JLG 450A_AJ Series II Service Manual - Manual (Page 127)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-77
2. Remove rotor set (8) and wearplate (9), together to
retain rotor set in its assembled form, maintaining
same rotor vane to stator contact surfaces. Drive link
(10) may come away from coupling shaft (12) with
rotor set, and wearplate. You may have to shift the
rotor set on the wearplate to work drive link out of
rotor and wearplate. Inspect rotor set in its assem-
bled form for nicks, scoring, or spalling on any sur-
face and for broken or worn splines. If 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 disassem-
bled during service. Mark surface of rotor and stator
facing UP, with etching ink or grease pencil before
removal to ensure correct reassembly of rotor into
stator and rotor set into motor. Mark all rotor compo-
nents and mating spline components for exact repo-
sitioning at assembly for maximum wear life and
performance of rotor set and motor.
NOTE: A polished pattern on wear plate from rotor rotation
is normal.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 center-
line are on the same stator centerline. Check rotor
lobe to roller vane clearance with a feeler gage at
this common centerline. If there is more than 0.005"
(0.13 mm) of clearance, replace rotor set.
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 perceptible lash (play) should be noted
between mating spline parts. Remove seal ring (4)
from housing (18) and discard.