JLG 450A II Series, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-60 – JLG Lift – 3121290
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 procedures 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 in bolt holes approximately 180° 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 reassem-
ble components in their original relationship to ensure ulti-
mate 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 nec-
essary clearance to assemble seventh or full comple-
ment 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 STA-
TOR HALF MUST BE REASSEMBLED 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 pli-
ers or other appropriate turning device and rotate cou-
pling shaft, drive link, and rotor to seat rotor and
assembled vanes into stator, creating necessary clear-
ance to assemble seventh or full complement of seven
vanes. Assemble seven vanes using minimum force.
Go to Step 14 on page 3-56 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 coupling shaft rotation.
4. Use test stand and check motor operation.
Installation
Refer to Figure 3-40., Swing Motor Removal and Installation.
1. Carefully insert swing motor into swing drive, making
sure swing motor shaft key is aligned correctly.
2. Secure swing motor to swing drive assembly with two
bolts and flat washers. Apply JLG threadlocker P/N
0100019 to threads of retaining bolts. Torque to 85 ft-lb
(115 Nm).
3. Connect hydraulic lines running to swing motor as
tagged during removal.
TORQUE