Pierce Enforcer, Operator'S Manual

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OPERATION
5-46 / Driving the Vehicle
© 2018 Pierce Manufacturing Inc. All Rights Reserved.
5-27. Axles
5-27.1 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.
IMPORTANT: Read the No-Spin differential operation and service manual provided by the axle
manufacturer for further information and safety instructions. Additional copies may be
obtained from the manufacturer, their website, or by contacting Pierce Customer Service.
Use extreme caution when accelerating or decelerating on slippery or unstable surfaces. Vehicles/
axles equipped with No-Slip traction differentials are inherently more sensitive to side-slip. Loss of
steering control can cause a crash that will injure or kill.
• Distribute the load evenly side-to-side;
• Do NOT exceed the vehicle's rated payload capacity;
• Keep the diameter of the tires equal.
Failure to observe these measures can create a difference in individual wheel speeds which can cause
the No-Spin differential to deliver power to only one side of the vehicle and thus cause steering
problems. Loss of steering control can cause a crash that will injure or kill.
Turn the engine off and raise all driving wheels of a No-Spin differential equipped axle when changing
tires to prevent the vehicle from moving.
Axles equipped with No-Spin differentials deliver power to both wheels - even when only one wheel is
on the ground. Vehicle will move if power is applied. Moving vehicle during maintenance work may
injure or kill.
Operate in low gear under power rather than coasting downhill into a turn.
Braking capacity is reduced when a No-Spin differential equipped vehicle makes a turn while coasting
downhill. Reduced braking capacity can cause a crash that will injure or kill.