OPERATION
5-48 / Driving the Vehicle
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5-27.4 Power Take-Off Control
Engage Power Take-Off (PTO) operated accessories with engine at idle speed.
Refer to the Power Take-Off Operation section of the Allison Transmission Operator’s Manual for additional
operation instructions.
5-28. Axles
5-28.1 No Spin Differential (Optional)
A No-Spin differential powers both wheels, yet freely permits wheel speed differentiation when required. Prime
functions:
• Assures 100% of the available torque and increases drawbar pull;
• Prevents wheel spin and power loss when one wheel loses traction;
• Compensates for differences in wheel travel when turning or operating on uneven surfaces.
As long as the vehicle is operated in a straight forward or reverse direction over a smooth surface, the No-Spin
differential allows the vehicle to perform as if the axle half-shafts had been welded - the axle is completely locked.
This means both wheels turn at the same speed. If one wheel loses traction or leaves the ground, the opposite
wheel, which still has traction, continues to drive the vehicle until traction is regained by both wheels. There can be
no one wheel spinout.
When the vehicle turns a corner, or when one wheel passes over an obstruction, the outside wheel, or the wheel
passing over the obstruction, must travel a greater distance and therefore faster than the other wheel. When this
occurs, the No-Spin differential automatically allows for the necessary difference in wheel speed.
During extremely cold weather, hot-shift PTO clutches may momentarily transmit power even though
they are disengaged. Never operate the engine with personnel in the vicinity of any driveshaft as it may
engage without warning. Hands, clothes, hair, etc., can get caught on spinning shafts and U-joints.
Failure to heed this warning may lead to personal injury or death.
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