SECTION 3 - CHASSIS, PLATFORM, & SCISSOR ARMS
3-4
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3.3
DRIVE HUB
Roll and Leak Testing
Always roll and leak test Drive-Hubs after assembly to
make sure that the unit’s gears and sealants are working
properly. The following information briefly outlines
what to look for when performing these tests.
THE ROLL TEST
The purpose of a roll test is to determine if the unit’s
gears are rotating freely and properly. You should be
able to rotate the gears in your unit by applying a con-
stant force to the roll checker. If you feel more drag in
the gears only at certain points, then the gears are not
rolling freely and you should examine them for
improper installation or defects. Some gear packages
roll with more difficulty than others. Do not be con-
cerned 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 air checker starts to fall once you
have pressurized the unit. Leaks will most likely occur at
the main seal or wherever o-rings or gaskets are located.
Usually you can detect the exact location of a leak by
brushing a soap and water solution around the main
seal and where o-rings or gaskets meet the exterior of
the unit, then checking for air bubbles. If you detect a
leak in a seal, o-ring, or gasket, replace the part immedi-
ately.
Tightening and Torquing Bolts
If you use an air impact wrench to tighten bolts, take
extreme care to ensure that you do NOT tighten the
bolts beyond their indicated torque specification. Never
use an impact wrench to tighten shoulder bolts. Always
tighten all shoulder bolts by hand.
The following steps describe the proper procedure for
tightening and torquing bolts or socket head
capscrews
in a bolt circle.
1. Tighten (but do not torque) bolt ”A” until snug.
2. Go to the opposite side of the bolt circle and tighten
bolt ”B” until equally snug.
3. Continue around the bolt circle and tighten the
remaining bolts.
4. Now use a torque wrench to apply the specified
torque to bolt ”A”.
5. Continue around the bolt circle and apply an equal
torque to the remaining bolts.
Oil Information
1. TYPE – EP90
On normal applications, use EP90. On applications
where the lubricant must meet special requirements,
the O.E.M. should be able to recommend a suitable
substitute.
2. OIL TEMPERATURE
Continuous – 160°F (70°C) Intermittent – 200°F
(95°C).
3. OIL CHANGE
Initial – After 50 hours or 50,000 revolutions of opera-
tion.
Subsequent – After 1000 hours or (1) year, whichever
comes first.
NOTE:
Higher temperatures make it necessary to change oil
more frequently.
4. OIL FILL LEVEL AND VOLUME
Unit mounted horizontal – half full
Approximate volume - 17 oz. (0.5 ltr)
5. REAR BRAKES
Rear brakes require 2.7 oz. (0.08 ltr) of DTE 13M
hydraulic fluid each to function properly.
“A”
“B”
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