JLG 10MSP Service Manual - Manual (Page 37)

SECTION 3 - BASE COMPONENTS
3121228 – JLG Lift – 3-5
3.4 DRIVE/ELEVATION CUT-OUT SWITCH
INSTALLATION
3.5 WHEEL DRIVE ASSEMBLY - SERVICING
The component parts of the left and right drive motor
assemblies are identical. The left drive motor is run in the
reverse direction of the right motor.
Roll and Leak Testing
Torque-Hub units should always be roll and leak tested
before disassembly and after assembly to make sure that
the unit's gears, bearings and seals are working properly.
The following information briefly outlines what to look for
when performing these tests.
NOTE: The brake must be released before performing the roll test.
This can be accomplished by supplying 24 Volts D.C. to the
gray 2-pin brake connector.
The Roll Test
The purpose of the roll test is to determine if the unit's
gears are rotating freely and properly. You should be able
to rotate the wheel or hub of the gearbox by hand. If you
feel more drag in the gears only at certain points, then the
gears are not rolling freely and should be examined for
improper installation or defects. Some gear packages roll
with more difficulty than others. Do not be concerned if
the gears in your unit seem to roll hard as long as they roll
with consistency.
The Leak Test
The purpose of a leak test is to make sure the unit is air
tight. You can tell if your unit has a leak if the pressure
gauge reading on your leak checking fitting starts to fall
after the unit has been pressurized and allowed to equal-
ize. Leaks will most likely occur at the pipe plugs, the
main seal or wherever o-rings are located. The exact loca-
tion of a leak can usually be detected by brushing a soap
and water solution around the main seal and where the o-
rings or gaskets meet on the exterior of the unit, then
checking for air bubbles. If a leak is detected in a seal, o-
ring or gasket, the part must be replaced, and the unit
rechecked. Leak test at 10 psi for 20 minutes.
NOTE: Due the small air volume inside this Torque-Hub, it will pres-
surize to 10 psi very quickly. If the pressure becomes exces-
sive in the unit the seals will be destroyed.
Oil Type and Capacity
This torque hub unit is shipped with ISO 68 viscosity oil
(hydraulic fluid). It is designed to utilize the same oil
throughout its service life. However, should it need to be
serviced the oil will need to be drained and replaced.
In the event of servicing, fill the unit with ISO grade 68 oil
or oil of a similar viscosity (80W gear oil or 20W engine oil).
The gearbox will need to be filled with 10 oz of oil.
Drive/Elevation Switch Cut-Out Switch Installation
1. Mounting Screws (a)
2. Proximity Switch (b)
3. Switch Mounting Block 4. Mounting Holes
5. Proximity Switch (b)
NOTE: (a) Apply Loctite #242 to mounting screw threads on
final assembly.
(b) The 10MSP is designed with two (2) drive/elevation
cut-out proximity switches in the event that if one fails
the other will continue to operate. Both are plugged into
the wiring harness to the P2 connector on the Ground
Control Station. If either switch would fail the Ground
Control Module will signal a fault condition.
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