Multiquip DCA-70SSJUSERIES —TRAILERMAINTENANCE, Tires/Wheels/Lug Nuts, Tire Wear/Inflation

DCA-70SSJU SERIES —TRAILER MAINTENANCE

Tires/Wheels/Lug Nuts

Tires and wheels are a very important and critical components of the trailer. When specifying or replacing the trailer wheels it is important the wheels, tires, and axle are properly matched.

CAUTION:

DO NOT attempt to repair or modify a wheel. DO NOT install in inner

tube to correct a leak through the rim. If the rim is cracked, the air pressure in the inner tube may cause pieces of the rim to explode (break off) with great force and cause serious eye or bodily injury.

Tire Wear/Inflation

Tire inflation pressure is the most important factor in tire life. Pressure should be checked cold before operation DO NOT bleed air from tires when they are hot!. Check inflation pressure weekly during use to insure the maximum tire life and tread wear.

Table 16 (Tire Wear Troubleshooting) will help pinpoint the causes and solutions of tire wear problems.

TABLE 16. TIRE WEAR TROUBLESHOOTING

WEAR PATTERN		CAUSE	SOLUTION
		Over Inflation.	Adjust pressure to
	Center Wear		particular load per tire
			manufacturer.
			Adjust pressure to
	Edge Wear	Under Inflation.	particular load per tire
			manufacturer.
	Side Wear	Loss of camber	Make sure load does
			not exceed axle rating.
		or overloading.
			Align wheels.
	Toe Wear	Incorrect toe-in.	Align wheels.
	Cupping	Out-of-balance.	Check bearing adjustment
			and balance tires.
	Flat Spots	Wheel lockup &	Avoid sudden stops when
		tire skidding.	possible and adjust brakes.

Suspension

The leaf suspension springs and associated components (Figure 77) should be visually inspected every 6,000 miles for signs of excessive wear, elongation of bolt holes, and loosening of fasteners. Replace all damaged parts (suspension) immediately. Torqued suspension components as detailed in Table 17.

Figure 77. Major Suspension Components

Table 17. Suspension Torque Requirements

Item	Torque (Ft.-Lbs.)
3/8" U-BOLT	MIN-30 MAX-35
7/16" U-BOLT	MIN-45 MAX-60
1/2" U-BOLT	MIN-45 MAX-60
SHACKLE BOLT	SNUG FIT ONLY. PARTS MUST ROTATE FREELY.
SPRING EYE BOLT	LOCKING NUTS OR COTTER PINS ARE PROVIDED
	TO RETAIN NUT-BOLT ASSEMBLY.
SHOULDER TYPE	MIN-30 MAX-50
SHACKLE BOLT

CAUTION:

ALWAYS wear safety glasses when removing or installing force fitted parts. Failure to comply may result in serious injury.

DCA-70SSJU SERIES — OPERATION AND PARTS MANUAL (STD)— REV. #5 (06/03/03) — PAGE 51