At regular intervals, or during other scheduled maintenance (tire
rotation/service, wheel bearing service, alignment, etc.), the kingpins
should be checked for excessive wear. Refer to the service manual for
proper procedures.
Toe-in setting - general inspection
Inspecting steer axle tires in the first 3,000–10,000 service miles
(5,000–16,000 service km) generally shows if tires are wearing normally.
Rapid outside shoulder wear on both tires indicates too much toe-in.
Rapid inside shoulder wear on both tires indicates too much toe-out. In
P&D-type service, left-to-right steer tire tread life differentials up to 40%
can be observed depending on routes and other variables.
Follow the tire manufacturer’s recommended cold inflation pressure for
the tire size, load range (ply rating) and steer axle loading typical for
their operation (each steer axle tire equals
1 2steer axle loading).
Special applications may warrant a setting based on experience with the
type of tire operating loads and conditions. Radial tires are more
sensitive to toe-in setting than bias ply tires. While not insensitive to
vehicle alignment, fine tuning school bus alignment to line-haul truck
standards does not drastically improve tire tread life.
It is essential that correct toe-in and tire pressure be maintained for
optimum tire wear.
Rear axle - general inspection
Make sure that the axle mounting U-bolts, attaching or mounting bolts
and nuts are securely tightened. Refer toU-bolt nut torquein this
chapter. Regularly check the rear axle for damaged, binding or worn
parts.
NoSpin Detroit Locker positive locking differential
Vehicles equipped with this type differential have the operator’s manual
supplied with the vehicle. Refer to this manual for maintenance checks.
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REFILL CAPACITIES
Rear axle - Eaton-Spicer models
Axle codeWeight capacity - lb
(kg)DescriptionPints
(Liters)1,2
S135–S 13500 (6123) Single reduction 24.5 (11.6)
4S150–S 15500 (7031) Single reduction 24.5 (11.6)
17060S 17500 (7938) Single reduction 28.0 (13.2)
19055T 17500 (7938) Two-speed 28.0 (13.2)
M190T 19000 (8618) Two-speed 35.0 (17.0)
19060S 19000 (8618) Single reduction 28.0 (13.2)
21060S 21000 (9525) Single reduction 28.0 (13.2)
21060D 21000 (9525) Single reduction,
driver-controlled
locking differential28.0 (13.2)
M210T 21000 (9525) Two-speed 16.0 (33.0)
23090S 23000 (10432) Single reduction 39.0 (18.5)
23090D 23000 (10432) Single reduction,
driver-controlled
locking differential39.0 (18.5)
23082T 23000 (10432) Two-speed 37.0 (17.5)
1Quantities listed are approximate. Fill axle until the lubricant level is at
the bottom of the filler hole, with the vehicle on level ground.
2If hubs are removed, add an additional 1.6 pints (0.75L) of axle
lubricant. Add lubricant through the axle vent.
Rear axle - Meritor models
Axle model Pints (Liters)*
RS-17–140 28.6 (13.5)
RS-17–144 32.0 (15.0)
RS-17–145 33.6 (15.9)
RS-17–220 30.7 (14.5)
RS-17–224 29.0 (13.0)
RS-19–144 32.0 (15.0)
RS-19–145 33.2 (15.7)
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