657 TRACTOR-SCRAPER Controls Caterpillar


Controls
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1.1. Tractor Individual Wheel Brakes
2.1. Differential Lock
3.1. Hydraulic Retarders
4.1. Bowl
5.1. Apron
6.1. Ejector
7.1. Cushion Hitch
8.1. Bail
9.1. Cushion Hitch and Bail
10.1. Bowl - Apron

Tractor Individual Wheel Brakes

Push handle forward to apply tractor right wheel brake.

Pull handle back to apply tractor left wheel brake.


NOTICE

Do not use tractor individual wheel brakes to steer tractor.


Differential Lock

Depress pedal to lock differential.

Release pedal to unlock differential.


NOTICE

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


Hydraulic Retarders

Pull lever back to apply retarders.

Push lever forward to release retarders.

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

Bowl


(1) RAISE

(2) HOLD

(3) LOWER

(4) QUICK DROP

Apron


(1) RAISE

(2) HOLD

(3) LOWER

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

Ejector


(1) FORWARD

(2) HOLD

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

(4) OVERRIDE - Fast return.

Cushion Hitch

Pull control for CUSHION RIDE.

Push for hitch LOCKDOWN.


NOTICE

Be sure hitch area is clear of obstructions.


Bail

Pull control to RAISE bail.

Push down to LOWER bail.


NOTICE

Be sure area in front of machine is clear before operating bail.


Cushion Hitch and Bail


(1) LOCKDOWN - BAIL DOWN

(2) LOCKDOWN - BAIL UP

(3) CUSHION RIDE - BAIL UP

Bowl - Apron

Push handle forward to LOWER apron. Handle in upright position is HOLD. Operation of standard apron and bowl controls is the same.