JLG 450A_AJ Series II Service Manual - Manual (Page 139)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-89
Two Piece Stator Assembly
A disassembled rotor set (8) that cannot be easily by hand
and has a two piece stator, can be assembled using the
following procedures:
1. Place stator half on wear plate (9) with seal ring (4)
side down, after following motor assembly proce-
dures 1 through 13. Be sure seal ring is in place.
2. Align stator bolt holes with wear plate and
housing bolts. Turn two alignment studs
finger tight into bolt holes approximately 180 degrees
apart to keep stator half and wear plate stationary.
3. Assemble rotor, counterbore down if applicable, into
stator half, and onto wear plate (9) with rotor splines
into mesh with drive link (10) splines.
NOTE: Use marking applied to rotor set components to
reassemble components in their original relationship
to ensure ultimate wear life and performance.
4. Assemble six vanes, or as many vanes that readily
assemble into stator vane pockets.
EXCESSIVE FORCE USED TO PUSH ROTOR VANES IN PLACE
COULD SHEAR OFF COATING APPLIED TO STATOR VANE
POCKETS.
5. Grasp output end of coupling shaft (12)
with locking pliers or other appropriate turning
device and rotate coupling shaft, drive link and rotor
to seat rotor and assembled vanes (8C) into stator
half, creating necessary clearance to assemble sev-
enth or full complement of seven vanes. Assemble
the seven vanes using minimum force.
6. Place second stator half on a flat surface with seal
ring groove up. Apply a small amount of grease to a
new seal ring (4) and install it in stator half ring
groove.
7. Assemble second stator half over two alignment
studs and rotor with seal ring side down onto the
first stator half aligning any timing marks applied for
this purpose.
IF STATOR HALF (8B) IS A DIFFERENT HEIGHT (THICKNESS)
THAN STATOR HALF (8D) STATOR VANES (8C) OR (8E)OF THE
SAME LENGTH (HEIGHT) AS STATOR HALF MUST BE REASSEM-
BLED IN THEIR RESPECTIVE STATOR HALF FOR ROTOR SET TO
FUNCTION PROPERLY.
8. Assemble six vanes, or as many vanes that readily
assemble into stator vane pockets.
9. Grasp output end of coupling shaft (12)
with locking pliers or other appropriate turning
device and rotate coupling shaft, drive link, and rotor
to seat rotor and assembled vanes into stator, creat-
ing necessary clearance to assemble seventh or full
complement of seven vanes. Assemble seven vanes
using minimum force.
Go to Step 14 on page 3-85 to continue assembly.
Final Checks
1. Pressurize motor with 100 psi dry air or nitrogen and
submerge in solvent to check for external leaks.
2. Check motor for rotation. Torque required to rotate cou-
pling shaft should not be more than 50 ft-lb (68 Nm).
3. Pressure port with “A” cast under it on housing (18)
is for clockwise coupling shaft rotation as viewed
from the output end of coupling shaft. Pressure port
with “B” cast under it is for counter clockwise cou-
pling shaft rotation.
4. Use test stand and check motor operation.
Installation
Refer to Figure 3-55., Swing Motor Removal and Installation.
1. Carefully insert swing motor into swing drive, mak-
ing sure swing motor shaft key is aligned correctly.
2. Secure swing motor to swing drive assembly with
two bolts and flat washers. Apply threadlocker JLG
P/N 0100019 to threads of retaining bolts and torque
to 85 ft-lb (115 Nm).
3. Connect hydraulic lines running to swing motor as
tagged during removal.
TORQUE