So if the inching valve does not let the clutch slip, what is the purpose then? My understanding is the clutch piston has a small orifice in, thus if oil in is less than what can leak out, clutch is disengaged. In the torque converter side there are two regulator valves: Pressure regulator valve and Converter regulator valve. Pump->inching valve->Forward/reverse clutch valve(basically a seat interlock)->FNR selector valve-> clutch packs But, the hydraulic diagram shows the pressure from the pump T'ing of to the inching system and the torque converter.
Someone else also suggested the torque converter. I would suggest you pull the transmission out and get it rebuilt by a transmission shop.
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The clutches in an auto are either engaged or free they don't operate like the clutch in a manual car so when you put an auto in drive the first gear pack will engage and the torque converter will slip and when you push the accelerator pedal the engine revs a little and causes the torque converter to apply a driving force from the motor to the transmission. The last auto i rebuilt - a turbo 350 for a 4wd about 12 years ago was a learning experience ! I think i spent more time making tools to knock bushes in than i did putting the damned thing back together - after that experience i started using a reputable transmission shop. While the internals of the older transmissions are not overly complicated you have to know what you are doing especially with clearances and end float - too tight and it will bind up and the tinyest piece of dirt in the metering block where the spool valves run will at best cause them to stick - at worse it can score the valve or housing causing it to stick and this is usually throw it away time ! If it is slamming into gear there are dampening pistons in the metering block that when the hydraulic pressure is applied to the clutch pack these pistons are forced into thier cylinder against spring pressure taking the shock loading out of the system so they could be seized. The reason that putting in neutral sort of resets this is because hydraulic pressure is used to drive the clutch pistons back out releasing the pressure on the clutch pack, it also is used to move the spool valves back and forth in the metering block. If the only way you can stop it once you have released the pedal is to seleect neutral it would suggest the toque converter or fluid flywheel is seized and you are trying to use the inching pedal to disconnect the drive and the fact that it goes into reverse and takes off would indicate this. įorward and reverse in an auto trans is selected by directing hydraulic pressure to either of the two clutch packs or possibly a band inside the transmission and as you unit is only single speed the clutch packs / band for 2nd and 3rd may not be installed. If the inching valve sort of works in forward but not at all in reverse that would indicate to me that the issue is the transmission and not the inching valve. Many members are experts at recovery old, and not so old, equipment back to use. There are people on there who are solving these problems (almost) every day. You might find you will get more information from the MadModder site.
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