Checking Tires

NOTE: Tires exposed to sunlight, ozone, or electrical discharge will eventually develop cracks. If these cracks extend to the cord body, the tire must be replaced.

Protect tires from exposure to petroleum products, and chemicals.

Drive carefully. Try to avoid rocks and sharp objects.

IMPORTANT: Each time wheel bolts are loosened, tighten bolts to specification after 1 hour and every 10 hours thereafter until torque stabilizes.

After torque stabilizes, tighten bolts every 100 hours.

1. 
   N75318-UN-23APR07

   A - Drive Wheel Bolts

   Tighten drive wheel bolts to specification.

   Item	Measurement	Specification
   Drive Wheel Bolts	Lubricated Torque	610 N·m (450 lb.-ft.)

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2. 
   N75310-UN-27MAR07

   A - Rear Axle Wheel Nuts

   B - Center Disk To Waffle Rim Bolts

   Tighten rear axle wheel nuts (A) to specification.

   Item	Measurement	Specification
   Rear Axle Wheel Nuts	Lubricated Torque	610 N·m (450 lb.-ft.)

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3. Tighten rear wheel center disk to waffle rim bolts (B) to specification.

   Item	Measurement	Specification
   Rear Wheel Center Disk to Waffle Rim Bolts	Dry Torque	332 N·m (245 lb.-ft.)

4. Visually inspect all tires daily for damage or noticeably low pressure. Consider replacing tire if any of the following conditions exist:

   • Worn tread
   • Unusual or spotty tread wear
   • Isolated bulges or bubbles in tread or sidewall
   • Torn or missing drive lugs
   • Deep cracks or cuts in tread or sidewall that extend to the cord body
   • If the tire repeatedly loses more than 20% of its rated pressure without explanation, and repair does not eliminate repeated pressure loss
   
   

5. IMPORTANT: Maintain correct tire pressure to prevent damage to tires.

   At least every 100 hours of operation, check tire pressure.

   Tire	Size	Inflation Pressure
   Dual Drive Tires	520/85R42 (R1, R2)	248 kPa (2.5 bar) (38 psi)
   Rear Axle Steering Tires	520/85R34 (R1) IF580/80R34 (R1W)	324 kPa (3.2 bar) (47 psi)