650 & 660 TRACTOR-SCRAPERS Controls Caterpillar

1.1. Tractor Individual Wheel Brakes
2.1. Differential Lock
3.1. Hydraulic Retarder
4.1. Bowl
5.1. Apron
6.1. Ejector
7.1. Transmission Hold
8.1. Traction Unit
9.1. Bowl - Apron

Tractor Individual Wheel Brakes

Push handle forward to apply tractor right wheel brake.

Pull handle back to apply tractor left wheel brake.


Do not use tractor individual wheel brakes to steer tractor.

Differential Lock

Depress pedal to lock differential.

Release pedal to unlock differential.


Do not attempt to turn tractor when differential lock is applied.

Hydraulic Retarder

Pull lever back to apply retarder.

Push lever forward to release retarder.

Anticipate the use of the retarder. Three or four seconds are needed to engage the hydraulic retarder once the lever is moved. Handle position determines the amount of retarding. The farther back the handle, the more braking action. Use retarder at least once a week to keep seals lubricated.



(2) HOLD





(2) HOLD


(4) FLOAT - Control will lock in this position until moved manually.



(2) HOLD


(4) LOCKOUT - Control will lock in this position until ejector returns to rear or another control is engaged.


Do not move ejector forward when bowl is full and apron is closed.

Transmission Hold

Depress pedal to lock transmission in desired gear speed.

Release pedal to allow transmission to shift automatically.


Do not downshift when transmission hold pedal is depressed.

Traction Unit

Turn traction control knob to left (counterclockwise) for normal operation. Turn knob to right (clockwise) for transferring additional weight to the drive wheels to increase traction. The more the knob is turned to the right the greater the weight transfer.

------ WARNING! ------

Operating with traction unit fully engaged under certain conditions, such as uphill, may reduce weight on front wheels below safe steering level. Always operate traction control with caution to maintain safe steering control. Do not engage traction unit when traveling above second transmission range.


Bowl - Apron

Push handle forward to lower apron.

Handle in upright position is HOLD.

Operation of standard apron and bowl controls is the same. (See page 12.)