ALLISON-OM1334EN

ENGINE-DRIVEN PTO

Some models provide PTO mountings on the top and side of the torque converter

housing. The type of PTO installed will determine the operating procedures.

If the PTO driven gear is in constant mesh with the drive gear in the converter housing,

and a friction clutch is used to connect the PTO load, the PTO can be engaged or

disengaged at any time (except at engine speeds that exceed drive speed limits

imposed on the driven equipment). If the PTO is engaged by either a sliding gear or

dog clutch, the vehicle engine must be stopped to engage or disengage the PTO. Do

not exceed the drive speed limits of the driven equipment.

CONVERTER-DRIVEN PTO

A power takeoff may be mounted onto the mounting pad on the side of the

transmission. The PTO drive gear is turbine driven and thus provides infinitely

variable speeds. The power takeoff can be operated when the vehicle is either moving

or stopped. However, on some applications the PTO can be operated only when the

transmission is in neutral.

To operate the power takeoff, follow these instructions:

• Stop the vehicle, set the brakes, and idle the engine.

• Place the shift selector in a drive range.

CAUTION:

Always allow the engine to return to idle speed before

shifting to a forward or reverse range after operating the PTO with

the transmission in neutral. Failure to return to idle will subject the

transmission to excessive shock loads which could cause clutch

and/or shaft damage.

POWER TAKEOFF

OPERATION

ALLISON-OM1334EN - Page 28 of 48