It’s been a while since have posted anything . So here’s the issue. Cat d4d (7R 0735), went to operate machine one cold morning (28 degrees) machine barely moved in first gear (power shift trans) after 15 minutes warm up machine seemed to operate OK, did not run for extended period. Went back week later warmer day (45 degrees). Barely moved ,did not wait for warm up because I want to pull the radiator because of overheating issues. My question is where exactly is the magnetic screen. Trans has worked flawlessly up till now only issue, fluid would drop on dip stick after operating for a period of time. Any advice would be appreciated, as I have found this an invaluable resource. Thanks to all contributors, especially NIGE .
That machine don't have a mag screen. Pull transmission filter it's under floor boards. If the oil is bad might as well change it 10 gallons and if you do you can clean screen in the bottom of transmission. Bob
The screen is in the bottom of trans I think there is 6 bolts holding it
Thanks for replying. I will try to change filter and clean screen tomorrow weather permitting.
There is a cylindrical bulge on the right front of transmission, would this contain the screen.
Yes
13,14,15
Thanks Dave
Drained transmission fluid today,screen checked out clean. Removed transmission filter, had to order one none in stock. Hoping new filter solves the problem.
Was the screen plugged
No it was not Dave, very little trash on screen almost none. Small amount on magnetic drain plug. Pull the filter, could not tell if it was clogged. Filled filter with diesel fuel and plugged bottom hole, would not readily flow.
The main filter has a bipass on it so the main filter is not the culprit
Try cutting a section out of the filter and squeeze it in a vice to remove the oil. Then look in the bottom of the pleats for particles. Plenty of "how to" videos on YouTube. Your filter will not be a spin-on like the one in the video but the idea is the same.
Currently out of place, will be tomorrow before l get back to it. Dave your post about the filter by pass has dashed my hope for an easy fix. Nige I will check filter as you suggested.
transmission pump is normally the culprit
What does this entail as far as removal and repair.
I would just replace it you can get a Cat yellow mark or a after market one should be mounted to the flywheel housing on the top . You should check your main pressure first off off the filter housing 250-350 psi don't know exact but you can look it up. $744.00 Cat
Thanks Dave,would I have to drop the new trans fluid and replace the new filter. Currently trans is empty and filter is out.
No it is on top
What. Is involved in changing out the Pump
It has been years since I worked on one It looks like it is mounted on the bottom of converter I can't get a good reference in the parts book.Ask Nidge if he can send you info on removing pump it just unbolts and might have to pull drive gear off. I would still run a pressure test though
The transmission pump is mounted in the round housing next to the filter on top of the transmission. Hook a gauge up to the filter and run the machine. Bob
I was able to put a new filter and fluid in today. Transmission seems to be working properly. I was not able to run for an extended period of time, due to other obligations. Thanks to all who replied to my post.
Just out of interest what fluid did you put into it..?
TO4 SAE 30 , container specified cat drive train. And seem to take a lot more to refill it than drained out. Had a leak in the system somewhere , but was not evident when I removed the belly. Two lines going to a cooling system from transmission had rubber hose connections that the clamps were loose , tightened . Hope that helps. Have not opened filter yet.
Ran the old Cat , no issues except tree broke exhaust muffler adapter (the part between muffler and manifold) . Anyone know the part #.
2P8938 Just noticed you are from NC where at?
Albertson , small community 70 miles North of Wilmington.
Thanks Dave for the part #, I search for that part without the # for an hour , no luck till you have gave me the number. Thanks for help.
Glad your dozer is working fine