| Author | Message | ||
| Randy Humburg (Rands_gmc_5302)
Registered Member Username: Rands_gmc_5302 Post Number: 1 Registered: 4-2008 Posted From: 69.210.128.41  Rating: N/A |
67 GMC with v730 Allison Transmission air shifter and it won't engage. The air shifter is working. The shift rod is moving. Fluid is all normal. What else should I look for before I pull the pan? This is the first time I have tried to move it since my trip to Daytona in March when I backed it into the driveway and parked it. No problems at that time that I noticed at all. Thanks Much, Randy | ||
| Clint Hunter (Truthhunter)
Registered Member Username: Truthhunter Post Number: 153 Registered: 1-2009 Posted From: 24.129.235.190  Rating: N/A |
Not to be sarcastic, but if you did pull the pan what would you be looking for ? No knowledge on v730 to share , but general diagnostics procedures on automatic transmission (non-electronic) is done with pressure gauges attached to different ports with the transmission still intact and running and flow/pressure test charts to guide you; after confirming the simple things like the manual shift valve is moving with the linkage . There is also that old thing about the parking brake not having released . | ||
| Randy Humburg (Rands_gmc_5302)
Registered Member Username: Rands_gmc_5302 Post Number: 2 Registered: 4-2008 Posted From: 69.210.128.41 Rating: N/A |
I would be checking to see if the shaft that is moving on the outside is moving on the inside for starters. I'm checking on the pressure part of it using pressure gauges on the proper pressure ports but wont have that schematic until tomorrow from the Allison dealer but again everything was working fine up until I parked it last time so looking for something mechanical that simply broke. Maybe the shifter shaft or whatever drives the pump. | ||
| Dan West (Utahclaimjumper)
Registered Member Username: Utahclaimjumper Post Number: 171 Registered: 1-2005 Posted From: 208.66.38.60 Rating: N/A |
"Something mechanical that simply broke" will not happen by just sitting in storage.>>>Dan | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 253 Registered: 3-2006 Posted From: 216.198.139.38 Rating: N/A |
Randy Check the small nut on the shifter shaft. There is a small flat spot that also might have slipped and although you see the shifter go in and out it might not be moving the linkage. Try disconnecting the air shift linkage and move the lever manually. Next step is to use the pressure gages and check against the book. Bill | ||
| Frank Allen (Frank66)
Registered Member Username: Frank66 Post Number: 110 Registered: 10-2005 Posted From: 205.188.116.203 Rating: N/A |
had a problem with mine, turned out to be worn linkage, had to replace now it workes fine Frank Allen |