641B & 651B TRACTOR-SCRAPERS Every 1000 Service Hours Or 6 Months Caterpillar


Every 1000 Service Hours Or 6 Months
`
1.1. (22)Transmission System
2.1. (23)Differential And Final Drives
3.1. (23)aWheel Coolant
4.2. To check coolant level:
5.2. Later Machines:
6.2. Earlier Machines:

(22)Transmission System


NOTICE

Machine level, scraper lowered, parking brake set, transmission oil warm and engine stopped.


1. Remove transmission drain plug and allow oil to drain.

2. Remove oil sump drain plug.

3. Remove transfer gear case drain plug.

4. Remove hose and inspect seal. Use new seal if necessary.

5. Remove screen and wash in clean solvent.
6. Install screen and hose.
7. Change oil filter element and clean magnetic strainer. See Item 19.

8. Remove cover and screen.

9. Inspect cover seal. Install new seal if necessary.
10. Remove screen from cover. Wash screen and cover in clean solvent. Install screen to cover.

11. Install cover and screen. Clean and install all drain plugs.

12. Remove transmission breather cap. Remove element.
13. Wash element and cap in clean solvent.
14. Shake or blow dry.

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

When using pressure air, wear safety glasses and protective clothing. Use 30 PSI (2 kg/cm2) maximum pressure air for cleaning purposes.

------WARNING!--------
15. Install element and cap.
16. Fill transmission. See REFILL CAPACITIES.
17. Start engine and allow oil to circulate.
18. Check for leaks.

19. Check oil level. Maintain oil level to FULL mark on dipstick.

(23)Differential And Final Drives


NOTICE

Scraper lowered, parking brake set and engine stopped.


1. Remove differential breather.
2. Wash breather in clean solvent.
3. Shake or blow dry.

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

When using pressure air, wear safety glasses and protective clothing. Use 30 PSI (2 kg/cm2) maximum pressure air for cleaning purposes.

------WARNING!--------
4. Install breather.

(23)aWheel Coolant

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

Without wheel coolant the brakes can generate enough heat to burn the tire bead. This can cause the tire to explose with considerable force.

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

Use a solution of 20% antifreeze (Ethylene Glycol) and 80% water.

To check coolant level:

On either later or earlier machines, position wheel so fill plug is level with centerline of axle.

Later Machines:

1. Remove fill plug and check coolant level. Level should be to bottom of fill plug opening.
2. If necessary, add coolant solution to bring level to bottom of fill plug opening.
3. Install fill plug and tighten.

Earlier Machines:

NOTE: On earlier drive wheels, a brake drum stud must be removed for filling and checking. Non-drive wheels on the earlier machines may not have a plug in the outside wall of the wheel. Addition of a plug will greatly facilitate the coolant level check procedure.

1. Remove fill plug or brake drum stud.
2. If necessary, add coolant solution to bring level to bottom of fill plug opening.
3. Install plug or stud and tighten. Use thread lock compound to prevent leaking from the stud holes.