Cat 931 Transmission Quit Transmitting! Help!

NWAMike · 2012-09-07T19:55:04.000Z

Hello everyone, I've enjoyed reading everyone's posts for the past year. Thanks for the info! I have recently purchased a 'new' 1974 Cat 931 track loader. It is in good condition with 2100 hours. Test drove very well.....did it all well. Undercarriage at about 75% with no leaks, etc. Got it trailered home, serviced it, greased it and eased into the work here at the farm. Eased me into the work as well as the controls are a bit different than my prior dozer experiences. Worked great! Moves dirt, brush, trash just great. For about 2 weeks of off and on use. I backed up to pivot into the dirt pile, hit the right brake / clutch and no pivot. Both tracks stop as in no clutch release. No left pivot either, just brakes. I shut her down after several tries in all gears without clutch release. I tried later, same result. Next day, worse. No movement fore or aft. I pushed and pulled it over to the shop area (with great difficulty!). I checked all fluids....within spec. Removed trans filter screen. Minimal shavings upon cleaning. I buttoned it back up loosely to check oil flow.....not much pressure, even at half throttle. Hmmmmm. Engine starts and revs freely. Tracks 'tic' into gear. No driveshaft movement to the bevel gear. So, what do you think? A bad torque converter would bog / strain/ overheat the engine?? Cat dealer says, " Bring it in, we'll fix 'er rite up @ $99 per hour.... open ended" Lots of problems with that scenario....$$$$ and transport, etc. Any help will be appreciated!! Mike in NW Arkansas

Started by NWAMikeSep 7, 201226 replies

kbeenNew MemberOct 4, 2012#21
mike here is a side view of where the bolts go. you can see the hole half way down. just to the left of item # 10. good luck.
NWAMikeJunior MemberOct 4, 2012#22
KBeen, Yep, that is exactly where it is rocking! I will search it out tomorrow! Thanks for the help! Mike
Bob/OntNew MemberOct 4, 2012#23
Mike before you try to bolt the Barrel into place, take off the trans pump for free movement. Then reseal all connections, suction and pressure as you put it back together. Later Bob
wosama931bNew MemberOct 10, 2012#24
Hey there NWAMike, Do you have the transmission screen off?? If you do, get a small magnet with flex shaft, about a 1/4 dia. , Ck for loose or whatever you can find parts. I cleaned mine the other day, stainless steel with magnet inside, I used a couple cans of napa break cleaner, before washing in joy. Good luck, sam
wosama931bNew MemberOct 16, 2012#25
Trans, Screen
medic336New MemberMay 2, 2026#26
Cat 931 Anyone have a pdf manual? Its a traxcavator 931 with quick attach backhoe attachment
NigeLegendMay 2, 2026#27
medic336 said: Cat 931 Anyone have a pdf manual? Its a traxcavator 931 with quick attach backhoe attachment Click to expand... What sort of manual. Operation, parts, service.? Once that is answered then it needs a machine Serial Number to identify the appropriate manual. Manuals for the backhoe attachment may not be included with those for the machine and have to be obtained separately.

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