JLG T500J, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121200 3-39
Assembly
FOR PROPER OPERATION, THE MOTOR DEPENDS ON THE CORRECT ORIENTA-
TION OF PARTS AS WELL AS THE CORRECT INTERNAL TIMING.
1. Place the shaft on a clean flat surface with the output
end facing up.
2. Place the thrust bearing, then thrust washer, on the
shaft.
3. Install the shaft seal down onto the shaft making sure
the lip on the seal faces down. Refer to Figure 3-18., Seal
Orientation.
4. Install the teflon backup seal onto the shaft with the flat
side up and the seal lip facing the shaft seal.
5. Place the metal backup shim onto the shaft and against
the teflon backup seal.
6. Place the seal carrier onto the shaft (large end down)
and carefully press the seal carrier down onto the seal
assembly using an arbor press and sleeve to compress
the seals into the carrier.
7. Install the high pressure seal into the groove in the
housing.
8. Install the metal backup shim against the high pressure
seal in the groove in the housing bore by squeezing the
shim between the thumb and forefinger to bow shim
(bow in the shim should be in the shape of a hill and not
a valley for easier installation).
9. While maintaining the bow in the shim, start the shim
into the groove and use a small screwdriver to push the
shim into the groove. Install the wire ring into the
groove making sure the ends are butted.
Shaft Timing Procedure
FOR PROPER OPERATION, THE MOTOR DEPENDS ON THE CORRECT ORIENTA-
TION OF PARTS AS WELL AS THE CORRECT INTERNAL TIMING.
1. Turn shaft over so the output end of the shaft faces
down.
2. Install the cooling plug into the shaft making sure the
large OD end of the cooling plug faces up.
3. Lower the drive link into the shaft making sure that the
timing mark end of the drive link faces up and the tim-
ing mark on the end of the drive link is aligned with one
of the through holes in the shaft.
4. When the splines contact each other, slowly rotate the
drive link counterclockwise until the drive link splines
engage with those on the shaft.
5. Turn the housing over so the pilot of the housing faces
down and secure the housing in a vise.
6. Without disturbing the seal carrier assembly or drive
link, carefully lower the shaft assembly into the housing.
7. To seat the seal carrier against the wire ring, gently tap
the drive link down until the end of the shaft is nearly
flush with the rear surface of the housing.
8. Place a body seal in the groove in the rear surface of the
housing.
9. Using alignment marks as a guide, place the wear plate
on the housing making sure the notch in the wear plate
is aligned with the port side of the housing as shown in
Figure 3-19., Notch Alignment.
DUST SEAL
SPLIT WIRE

RING
HIGH

PRESSURE

SEAL
SEAL

CARRIER
METAL

BACKUP

SHIM
TEFLON

BACKUP

SEAL
SHAFT

SEAL
Figure 3-18. Seal Orientation
METAL

BACKUP

SHIM
NOTCH IN ROTOR
NOTCH IN STATOR
HOUSING

PORTS
Figure 3-19. Notch Alignment