637 TRACTOR-SCRAPER Controls Caterpillar


Controls
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1.1. Hydraulic Retarder
2.1. Tractor Individual Wheel Brakes
3.1. Differential Lock
4.1. Transmission Hold
5.1. Accelerator Lock
6.1. Bowl
7.1. Apron
8.1. Bowl-Apron (Single lever control)
9.1. Ejector
10.1. Cushion Hitch Only
11.1. Cushion Hitch and Bail

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 the retarder at least once a week to keep seals lubricated.

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 individual tractor wheel brakes to steer tractor.


Differential Lock

Depress pedal to lock differential.

Release pedal to unlock differential.


NOTICE

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


Transmission Hold

Depress pedal to lock transmission in desired gear range.

Release pedal to allow transmission to shift automatically.


NOTICE

Do not downshift when transmission hold is depressed.


Accelerator Lock

Push control lever down to engage accelerator lock.

Pull control lever up to disengage accelerator lock.

NOTE: The accelerator lock is automatically released when the brakes are applied.

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.

Bowl-Apron (Single lever control)

Apron will close when button on top of bowl control handle is pressed ...

... or when bowl control handle is tilted forward.* Handle in upright position is HOLD.


*The handle will stay tilted until the apron closes, then will return to the HOLD position.

Ejector


(1) FORWARD

(2) HOLD

(3) RETURN

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


NOTICE

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


Cushion Hitch Only


(1) CUSHION RIDE

(2) HITCH LOCKDOWN

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

Do not put hands or feet in cushion hitch area.

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

Cushion Hitch and Bail


(1) LOCKDOWN - BAIL DOWN

(2) LOCKDOWN - BAIL UP

(3) CUSHION RIDE - BAIL UP


NOTICE

Be sure bail and hitch areas are clear of personnel before operating control.