Bearing Lubrication; Seal Inspection And Replacement; Bearing Adjustment - JLG t350 Service And Maintenance Manual

Bearing Lubrication

Bearings should be lubricated every 12 months or 12,000
miles. The procedure to repack bearing cones is as fol-
lows:
1. Place a quantity of grease into the palm of your
hand.
2. Press a section of the widest end of the bearing into
the outer edge of the grease pile closest to the
thumb forcing grease into the interior of the bearing.
3. Repeat this while rotating the bearing from roller to
roller.
4. Continue this process until the entire bearing is
completely filled with grease.
5. Before installing, apply a light coat of grease on the
bearing cup.
Thickener Type.....................................Lithium Complex
Dropping Point .........................419° F (215°C) Minimum
Consistency................................................... NLGI No. 2
Additives................ EP , Corrosion & Oxidation Inhibitors
Viscosity Index ............................................ 80 Minimum
Approved Sources:
Mobil Oil ..........................Mobilgrease HP , Mobilith AW2
Exxon/Standard...............................................Ronex MP
Kendall Refining Co. ................................. Kendall L-427
Ashland Oil Co. ....................Valvoline Multipurpose GM
76 Lubricants.......................................... 76 Multiplex EP
Citgo Petroleum .................................... Lithoplex MP#2
Mystik ................................. Mystik JT-6 Hi Temp Grease
Pennzoil.............. Premium Wheel Bearing Grease 707L

Seal Inspection and Replacement

Whenever the hub is removed, inspect the seal to assure it
is not nicked or torn and is still capable of properly sealing
the bearing cavity. If there is any question of condition,
replace the seal.
To replace the seal:
3121198
SECTION 3 - CHASSIS & TURNTABLE
1. Pry the seal out of the hub with a screwdriver. Never
drive the seal out with the inner bearing as you may
damage the bearing.
2. Apply a sealant, such as PERMATEX, to the outside
of the new seal.
NOTE: Permatex sealant should not be used on rubber
encased seals.
3. Tap the new seal into place using a clean wooden
block.

Bearing Adjustment

If the hub has been removed or bearing adjustment is
required, the following adjustment procedure must be fol-
lowed:
1. Rotate the hub assembly slowly while tightening the
spindle nut to approximately 50 ft.lbs. (68 Nm).
2. Loosen the spindle nut to remove the torque. DO
NOT ROTATE THE HUB.
3. Finger tighten the spindle nut until just snug.
4. Back the spindle nut out slightly until the first castel-
lation lines up with the cotter key hole and insert the
cotter pin.
5. Bend over the cotter pin legs to secure the nut.
NOTE: The nut should be free to move with the only restraint
being the cotter pin.
– JLG Lift – 3-5