3CX transmission issues?
Posted: Mon May 29, 2023 9:09 am
Folks, I have a non turbo black cab JCB 3cx ~ 1988. It has about 5,000 hours on it as has been receiving some love lately, but there is obvious blow-by from the engine crankcase so I assume the compressions (untested) are low. I live on a remote island and it can take six or seven weeks to get even simple parts.
One job yet to be started is investigating poor driving thrust. The machine needs a great deal of throttle and revs to climb even a gentle slope. I don't have a working speedometer (yet) but I estimate full speed on the flat to be about 20kmph. The forward/reverse shuttle seems to operate perfectly. The four mechanical gears all seem OK and 4x4 works too.
The previous owner says he replaced the transmission fluid the week he sent me the machine but the workshop manual is a bit ambiguous regarding trans fluid levels. I have ordered trans filters and some ATF but they will not be here for weeks
Question: On a cold machine with the engine not running the ATF level is perfect on the dipstick (hard to read as the trans fluid is so clean), but checking the warm fluid level within 15 seconds of shutting down the engine shows no ATF on the dipstick. I wish I could just top up the transmission fluid and rre-test drive performance but I have virtually none available. Could the 'weak' drive be caused by something as simple as low trans level?
One job yet to be started is investigating poor driving thrust. The machine needs a great deal of throttle and revs to climb even a gentle slope. I don't have a working speedometer (yet) but I estimate full speed on the flat to be about 20kmph. The forward/reverse shuttle seems to operate perfectly. The four mechanical gears all seem OK and 4x4 works too.
The previous owner says he replaced the transmission fluid the week he sent me the machine but the workshop manual is a bit ambiguous regarding trans fluid levels. I have ordered trans filters and some ATF but they will not be here for weeks
Question: On a cold machine with the engine not running the ATF level is perfect on the dipstick (hard to read as the trans fluid is so clean), but checking the warm fluid level within 15 seconds of shutting down the engine shows no ATF on the dipstick. I wish I could just top up the transmission fluid and rre-test drive performance but I have virtually none available. Could the 'weak' drive be caused by something as simple as low trans level?