637 TRACTOR-SCRAPER Controls Caterpillar


Controls
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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. Cushion Hitch
9.1. Bowl-Apron
10.1. Bail
11.1. Accelerator Lock
12.1. Cushion Hitch and Bail

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.


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.

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

(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.


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.


Cushion Hitch

Pull up on control for CUSHION RIDE.

Push down for hitch LOCKDOWN.

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

Do not put hands or feet in cushion hitch area.

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

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 14.)

Bail


NOTICE

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


Pull control lever up to raise bail.

Push control lever down to lower bail.

Place control lever in DOWN position when parking or servicing machine.

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.

Cushion Hitch and Bail


(1) LOCKDOWN - BAIL DOWN

(2) LOCKDOWN - BAIL UP

(3) CUSHION RIDE - BAIL UP