JLG 740A, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121160 – JLG Lift – 3-75
13. Reposition motor in vise. Clamp across ports as
shown above. Do not clamp side of housing. Exces-
sive clamping pressure on side of housing causes
distortion.
14. Remove cap screws from mounting flange. These
screws are assembled with Loctite to hold them in
place.
The screws will require 35-45 Nm (300 - 400 in/lbs)
of torque to break loose and 11 Nm (100 in/lbs)
torque to remove. Do not use impact wrench on
screws that have been secured with Loctite. THis
could result in rounded heads or broken sockets.
NOTE: If torque higher than given above is required to break
screws loose, apply heat according to following
instructions.
When heated, Loctite partially melts. This reduces the
torque required to remove screw. Use small flame pro-
pane torch to heat small area of housing where screw
enters (see figure below). Be careful not to overheat hous-
ing and damage motor. Gradually apply torque to screw
with socket wrench as heat is applied for 8 to 10 seconds.
As soon as screw breaks loose, remove heat from hous-
ing. Continue turning screw until it is completely removed.
15. Carefully remove flange from housing.
SOME MOTORS MAY HAVE A QUAD SEAL AND BACK-UP RING IN
PLACE OF THE PRESSURE SEAL. THE QUAD SEAL AND BACK-UP
RING ARE NO LONGER AVAILABLE AND ARE REPLACED BY THE
PRESSURE SEAL. THEY ARE INTERCHANGEABLE, BUT SOME
PRECAUTIONS MUST BE TAKEN TO INSURE PROPER INSTALLA-
TION. FOLLOW THE REASSEMBLY INSTRUCTIONS.
16. Exclusion seal, back-up ring, pressure seal and seal
will come off with flange. Use seal removal tool as
shown to remove exclusion and pressure seals.
BE CAREFUL NOT TO SCRATCH SEAL CAVITY O.D. THIS COULD
CREATE A LEAK PATH.