SECTION 3 - BASE COMPONENTS
3-4
31215825
Caster Wheels - Installation
3.5 WHEEL DRIVE ASSEMBLY - SERVICING
The component parts of the left and right drive motor assem
-
blies 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 roll
-
ing 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 read
-
ing on your leak checking fitting starts to fall after the unit has
been pressurized and allowed to equalize. Leaks will most
likely occur at the pipe plugs, the main seal or wherever o-
rings are located. The exact location 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 exte
-
rior 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
pressurize to 10 psi very quickly. If the pressure becomes
excessive in the unit the seals will be destroyed.
Figure 3-6. Caster Wheel - Installation
NOTE:
(a) On assembly, apply Medium Strength Threadlock
-
ing Compound to threads.
(b) As required; Place unit on a flat surface, shim a
caster wheel that is consistently more than .015" off of
flat surface.
3
2
1
1.
Caster Wheel Assembly
2.
Attach Screws and
Washers (Qty. 4) (a)
3.
Caster Shim (b)
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