CATERILLAR D4-7U BULLDOZER IN NZ
REMOVING THE BACKEND TO GET AT STEERING CLUTCHES
The D4 work to remove and repair steering clutches is not as bad as a D2 but when a machine is old so are the nuts and bolts. We found by hitting the bolts with a hammer it loosened them a bit but it helps to have a good ratchet heavy duty lever arm etc to take the 3/4 bolts off & use CRC or a combination oil loosening agent like diesel fuel and oil mix. Remove inspection plate on rear of transmission cover & loosen steering clutch adjustments until free of their sockets before lifting off the main transmission cover above. Loosen the brake adjustment & swing pedal forward then use a sling (wire strop) to take the cover up and off the transmission section as very heavy. Check flywheel clutch lever is in the forward position to prevent the cams on the shaft in the cover from damaging the gear shift interlock section & the cover will lift off easy.
Exposing the rear steering clutches. You will need to loosen off the adjusting pins to remove the cover. These are shown above. These have rusted on and the bolts holding the brake shoes were worn right down
Both adjusting pins have been loosened off as shown here. On the left the brake pad nuts have rusted on & these will be replaced with the shoes which were worn out.
STERING CLUTCH INFO
| Clearance between shaft & Pressure plate bush |
.002" -- .004" |
| Max allowed clearance |
.015" |
| Clutch springs outer in pounds pressure |
161-178 |
| Clutch springs inner in pounds pressure |
123-136 |
| Clutch springs inner in pounds pressure compressed |
2 13/16" |
| Steering clutch min width |
3 1/8" |
| Steering clutch normal width |
3 7/16" |
| Steering clutch maximum width from face inner clutch & p.plate |
3 5/8" |
| Steering clutch inner drum-to-shaft pressure in tonnes |
20 |
| Steering clutch lever badjustment, free play |
3" |
Exposing the gearbox
Showing the steering clutches & you will see adjusters are unbolted for removal
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