© 2020 Pierce Manufacturing Inc. All Rights Reserved. Driving the Vehicle / 5-49
OPERATION
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.
5-28.2 Meritor Driver Controlled Differential Lock (DCDL) (Optional)
If the vehicle is equipped with DCDL:
• Engage DCDL only
under poor road conditions.
• Do not engage during downhill operation.
• Do not engage DCDL or operate the vehicle at speeds above 25 mph.
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.
When DCDL is engaged, an “understeer” condition can occur when making turns, so operate the
vehicle carefully. When you disengage DCDL, normal steering resumes.
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