JLG 500RTS ANSI Service Manual - Manual (Page 35)

SECTION 2 - PROCEDURES
3120696 – JLG Sizzor – 2-19
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 exam-
ined for proper installation or defects. Some
gear packages roll with more difficulty than oth-
ers. Do not be concerned if gears seem to roll
hard as long as they roll with consistency.
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 pressurized. Leaks will
most likely occur at main seal or wherever 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.