JLG 500RTS Service Manual - Manual (Page 37)

SECTION 2 - PROCEDURES
3120829 – JLG Sizzor – 2-21
c. Remove retaining ring from around spindle in
hub.Remove spacer from around spindle in hub.
Set hub, small end/spindle facing down, up on
something that will support hubs flange while it
lifts hub up so spindle is not resting on anything.
Carefully press or hammer spindle down out of
hub. If seal and bearing cone come out of hub
and rest on spindle, remove these parts from
spindle and set them aside. Discard seal.
d. If seal and bearing cone did not come out of
small end of hub when spindle was pressed out
of hub, remove seal and bearing cone from
small end of hub. Discard seal.
e. Bearing cone should be lying loose in wide end
of hub. Remove bearing cone from inside hub.
NOTE: If hammer and punch are used to remove bearing
cups, make sure counterbore is not struck with
punch when removing bearing cup.
f. Remove bearing cup from counterbore in small
end of hub.
g. Turn hub over and lift it out of flange-support.
Remove bearing cup from wide end of hub.
h. Press nine studs out of stud holes in hub.
Roll Test
The purpose of a roll test is to determine if the units gears
are rotating freely and properly. Gears should be able to
be rotated by applying a constant force to the roll checker.
If more drag is felt in the gears only at certain points, then
the gears are not rolling freely and should be examined for
proper installation or defects. Some gear packages roll
with more difficulty than others. Do not be concerned if
gears seem to roll hard as long as they roll with consis-
tency.
Leak Test
The purpose of the leak test is to make sure the unit is air
tight. The unit has a leak if the pressure gauge reading on
the air checker starts to fall once the unit has been pres-
surized. Leaks will most likely occur at main seal or wher-
ever o-rings or gaskets 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 o-rings or
gaskets meet 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.
Assembly
BEWARE OF SHARP EDGES IN COUNTERBORE WHEN INSTALL-
ING O-RING.
1. Assemble hub-spindle assembly as follows:
NOTE: Make sure cup sits square with counterbore before
pressing.
a. Set hub onto its large end. Press bearing cup
into counterbore in small end of hub.
b. Press nine studs into stud holes in hub.
c. Apply a light coat of Never-Seize to two pipe
plugs and tighten them into two pipe plug holes
in side of hub.
NOTE: Make sure cup sits square with counterbore before
pressing.
d. Turn hub over onto its small end. Press bearing
cup down into counterbore in deep end of hub.
e. Set hub onto its large end. Place bearing cone
into bearing cup.
f. Press seal into small end of hub.
g. Oil spindle, then lower hub, small end down,
onto spindle.
h. Press bearing cone onto spindle in hub.
i. Place spacer onto spindle in hub.
NOTE: Make sure the retaining ring is securely seated in
groove in spindle.
j. Place retaining ring over spacer onto spindle in
hub.
2. Grease o-ring and place it into counterbore in hub.
NOTE: O-ring may be stretched or pinched together to make
it fit counterbore exactly.
3. Oil all exposed surfaces inside hub.
4. Place internal gear into hub so that its internal
splines mesh with external splines of spindle. Oil
internal gear.
5. Place thrust washer around spindle so that it rests
on bottom of internal gear.
6. Stand input shaft on its splined end. Place one
spacer onto smooth end of input shaft.
7. Place one spring onto smooth end of input shaft.
8. Place other spacer onto smooth end of input shaft.