Thomas PROTOUGH 900, Owner/Operator And Parts Manual

Page: 53 / 165

4. MAINTENANCE
4.7 AS REQUIRED SERVICE
4.7B Tire and Wheel Maintenance
Inspect tires for cuts, cracks or uneven
wear. Check tire pressure and never over
inflate tires. Refer to the recommended
inflation pressure on the tire sidewall.
Wheels and studs should be checked for
cracks, deformation and proper and secure
attachment. Check wheel lug nut torques
for proper torque and visually inspect for
cracks or other damage.
Wheel Removal
Remove the lug nuts and remove both
the inner and outer wheels. Check wheels
and hubs for damage. Ensure that all studs,
lug nuts, and mounting faces of the hubs
and wheels are clean and free of grease and
debris.
Wheel Installation
• Mount both wheels over the hub boss-
es, being careful not to damage the stud
threads.
• Draw up the lug nuts alternately in the
sequence shown here. Do not tighten them
fully. This will allow uniform seating of
the lug nuts.
• Torque the lug nuts to 500-550 ft. lbs.
using this pattern.
51
Improper mounting torque can cause wheel
shimmy resulting in damage to the wheel
and axle parts. It may also cause discs to
crack in the stud hole area, extreme tire
wear, and stud breakage.
CAUTION
T90083
T90084
Clearance
22mm
Stud
Drum
15/16” (.94)
Dia. Bolt Hole
Disc Wheel
Disc Wheel Pilot
Drum Pilot
Pilot Mounted Disc