tbsalvagefab
Member
This is a mid 90s Cat Dp70 Forklift
SN T20C603002
6cy Mitsubishi na, 2 speed fwd-rev automatic, 15000lb capacity
Machine has 21,000 hrs- engine appears to have been "rebuilt" as there is a tag from EPS on the engine
I have been chasing a low power issue in this lift in my spare time. Typical struggling to traverse bumps, and going up hills is a fools errand. Machine will easily lift 15k, engine starts instantly, and it does go forwards and backwards. I do see a little white smoke when you leave it floored. Machine did not have any transmission oil on dipstick when I got it. Only history I know is that it was out of a blockyard with 3 other machines, no idea on circumstances. I also own a 8k hyster from that group of machines and it only needed a few seals and some engine oil to be a regular worker.
I have the manuals for this machine and have pulled pressures off the transmission
What I have done
Remarks
A low stall is either the TC or engine, and with it running as well as it does, I can't see how it is the engine.
I'm going to ask around locally and see if its' worth tossing it on a dyno just to rule the engine out entirely.
No visible carnage in TC, so at a loss there
When i first drained the machine i got about 5 gal out of it(didn't overfill a bucket). I'm pretty sure I added 6 gal of new ATF to the machine after changing filters/fluids (I didn't keep the receipt and its been several months), and now when I pulled the engine/trans I only got about 4.25 back out the pan. Is that a big enough difference from the needed 5.8 to possibly be the issue?
Been off and on this machine so my diagnosing and process is terrible. I just don't want to put it back together, overfill it, and pull it again. Even though that's probably what's going to happen. I just don't have any experience with automatics. Will try to post some pictures of TC bits
SN T20C603002
6cy Mitsubishi na, 2 speed fwd-rev automatic, 15000lb capacity
Machine has 21,000 hrs- engine appears to have been "rebuilt" as there is a tag from EPS on the engine
I have been chasing a low power issue in this lift in my spare time. Typical struggling to traverse bumps, and going up hills is a fools errand. Machine will easily lift 15k, engine starts instantly, and it does go forwards and backwards. I do see a little white smoke when you leave it floored. Machine did not have any transmission oil on dipstick when I got it. Only history I know is that it was out of a blockyard with 3 other machines, no idea on circumstances. I also own a 8k hyster from that group of machines and it only needed a few seals and some engine oil to be a regular worker.
I have the manuals for this machine and have pulled pressures off the transmission
- TC Inlet 62psi within the 7- 70psi
- Clutch pressures Low gear fwd and rev, 178ish after shifting(drops to 100 during a shift then immediately regains 178), within 150-230psi
- Main pressure is 178 within 150-198
- Can't test speed clutch as machine will not go fast enough
- Stall test 1700 rpm checked with optical tach off crank pulley, supposed to be 2050 +-100
What I have done
- Replaced transmission, fuel filters, and transmission oil. Have not found any glitter or chunks in filters/pans (cut apart and looked)
- Pulled and inspected clutch packs, frictions and steels measured new, resealed clutch pistons while I was in there.
- Pulled and inspected TC, Stator sprag clutch works, can't see any cracks in the pump or turbine. Can still see original machine marks and cast surfaces.
- Replaced head gasket because it was pressurizing coolant tank
Remarks
A low stall is either the TC or engine, and with it running as well as it does, I can't see how it is the engine.
I'm going to ask around locally and see if its' worth tossing it on a dyno just to rule the engine out entirely.
No visible carnage in TC, so at a loss there
When i first drained the machine i got about 5 gal out of it(didn't overfill a bucket). I'm pretty sure I added 6 gal of new ATF to the machine after changing filters/fluids (I didn't keep the receipt and its been several months), and now when I pulled the engine/trans I only got about 4.25 back out the pan. Is that a big enough difference from the needed 5.8 to possibly be the issue?
Been off and on this machine so my diagnosing and process is terrible. I just don't want to put it back together, overfill it, and pull it again. Even though that's probably what's going to happen. I just don't have any experience with automatics. Will try to post some pictures of TC bits