G'day all,
I have been helping a mate out trying to diagnose a long term Trans overheat issue on his D4H LGP series 3 and would appreciate any thoughts or ideas please, its been doing it for some time and gradually getting worse. As in it takes less time to get up around 115 to 120 deg c, (approx. 2 hrs) just shy of the EMS buzzer at 130. To date these are the things checked / tested:
Dozer is fitted with large wide stick rake and does general clean up work on farms, it operates just fine and has no dragging undercarriage/idlers etc.
Full Trans and Steering clutch / brake pressure test, all in spec (done multiple times over 12 months). Added and removed shims in TC outlet relief anyway to see if it made any difference to heating, no change.
Dismantled radiator assy and cleaned out tanks/cores, has run Cat ELC since new. Radiator drop approx. 9 deg c and oil cooler drop in to out approx. 14 deg c. Cooling system appears to be working ok and Trans does come down with Eng temp when no load / hi idle. When back to work it heats up quick again, Engine does not overheat at all.
Check for pinched or damaged lines to cooler, all good. Also manually checked oil flow into cooler, not done with flow meter but plenty of flow evident.
Replaced gauge and sender (no difference).
Changed oil to Cat 30W powertrain (was 50W), improvement in shifts (a bit quicker) and seemed to take a bit longer to heat up.
Checked resonator valve in Trans (some had issues here) all good, replaced spring and end plug anyway.
Done oil drop test on T/C to see if flooding was issue, approx. 2 lt drained out.
Decided to remove T/C and strip it regardless, condition almost like new. No parts required other than seals. Pump also checked as is like new also.
Where to next ! I did hear that some people added a oil to air cooler into the circuit, has anybody heard of this ?
Thanks
I have been helping a mate out trying to diagnose a long term Trans overheat issue on his D4H LGP series 3 and would appreciate any thoughts or ideas please, its been doing it for some time and gradually getting worse. As in it takes less time to get up around 115 to 120 deg c, (approx. 2 hrs) just shy of the EMS buzzer at 130. To date these are the things checked / tested:
Dozer is fitted with large wide stick rake and does general clean up work on farms, it operates just fine and has no dragging undercarriage/idlers etc.
Full Trans and Steering clutch / brake pressure test, all in spec (done multiple times over 12 months). Added and removed shims in TC outlet relief anyway to see if it made any difference to heating, no change.
Dismantled radiator assy and cleaned out tanks/cores, has run Cat ELC since new. Radiator drop approx. 9 deg c and oil cooler drop in to out approx. 14 deg c. Cooling system appears to be working ok and Trans does come down with Eng temp when no load / hi idle. When back to work it heats up quick again, Engine does not overheat at all.
Check for pinched or damaged lines to cooler, all good. Also manually checked oil flow into cooler, not done with flow meter but plenty of flow evident.
Replaced gauge and sender (no difference).
Changed oil to Cat 30W powertrain (was 50W), improvement in shifts (a bit quicker) and seemed to take a bit longer to heat up.
Checked resonator valve in Trans (some had issues here) all good, replaced spring and end plug anyway.
Done oil drop test on T/C to see if flooding was issue, approx. 2 lt drained out.
Decided to remove T/C and strip it regardless, condition almost like new. No parts required other than seals. Pump also checked as is like new also.
Where to next ! I did hear that some people added a oil to air cooler into the circuit, has anybody heard of this ?
Thanks
D4H Transmission overheat issues - 8200 SMU 8PJ
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