JLG E450A, Руководство по обслуживанию и ремонту

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SECTION 3 - CHASSIS & TURNTABLE
3-2 3121714
3. The tightening of the nuts should be done in stages. Fol-
lowing the recommended sequence, tighten nuts per
wheel torque chart.
4. Wheel nuts should be torqued after first 50 hours of
operation and after each wheel removal. Check torque
every 3 months or 150 hours of operation.
3.2 SPINDLE
Setting Wheel Bearing End Play
BE SURE NOT TO OVER-TIGHTEN THE SPINDLE NUT.
1. Tighten the spindle nut to assure the bearings are prop-
erly seated.
2. Loosen the spindle nut completely until the nut can be
turned by hand.
3. Tighten the spindle nut by hand using a socket without
rotating the hub.
4. If the cotter pin can be assembled with the spindle nut
finger tight, insert cotter pin without backing the nut
off. If the cotter pin cannot be assembled with the spin-
dle nut hand tight, tighten the spindle nut to the nearest
available slot and insert cotter pin. If more than ½ of the
cotter pin hole in the spindle can be seen in a slot, back
nut off to nearest slot and insert pin.
5. Check the unit for end play by moving the hub up &
down parallel along the centerline of the spindle. If you
can feel excessive end play (over the 0.010" [0.25 mm]
specification), recheck the nut to see what is causing the
excessive end play. Keep in mind that there can be some
movement and still be within the 0.010" (0.25 mm) max-
imum specification. If there is no way of getting the
excessive end play out by using your fingers, a socket or
wrench may have to be used to set the end play.
6. The units should be checked visually to make sure the
cotter pins are installed and that the correct compo-
nents have been used. Each unit must also be checked
for the proper feel to make sure there isn’t excessive end
play and the hubs turn freely.
7. Insert the dust cap and check to make sure the cotter
pin is not going to interfere. Cap must be pressed all the
way down. The unit should be checked again to assure it
spins freely after the dust cap is installed.
Specifications
The end play specification is 0.001”/0.010" (0.025 / 0.254
mm) for all units.
Checking
The end play is checked by clamping the spindle in a fixture or
vise and moving the hub parallel to the spindle centerline
without rocking the hub. If the end play is set properly the fol-
lowing should apply:
1. Hub should rotate freely when spun by hand.
2. The hub should not be noticeably loose when moved
parallel with spindle centerline.
Greasing Requirements
Hub assemblies shall have grease packed in the bearings via
an appropriate greasing spindle or by hand. In either method,
the bearing must be greased so the grease is forced through
the entire bearing cavity and through the rollers of both inner
and outer bearings.
Dust or grease caps used shall have grease applied to the
inside of the cap.
The bearing cavity shall be filled 50 - 80% full of grease on all
applications.
Dust or grease caps shall also be filled 10-20% full of grease on
all applications prior to final assembly.
Visually verify that grease has flowed all rollers of the inner
and outer bearings.
Table 3-1. Wheel Torque Chart
TORQUE SEQUENCE
1st Stage 2nd Stage 3rd Stage
40 ft. lbs.
(55 Nm)
100 ft. lbs.
(130 Nm)
170 ft. lbs.
(255 Nm)