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PowerShift Advice Needed

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Jim B.

05-28-2007 08:18:05

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Need experienced tech help for a strange problem with the Powershift (RPS) in our 2470 >>>>

History: We temporarily overfilled the oil supply in the RPS/Tranny/Hydraulic system in an effort to make a home-made 3-Point forklift fully extend. The unit has a one-way cylinder, 6 inch dia x 8' long so it takes alot of oil to fully extend it. Then we modified the plumbing and seals on the big cylinder to make it into a 2-way so the oil required would be minimal and the tractor control valves and hookups would work properly. Did all this last fall and forgot that the hydraulic oil supply in the tranny may still be overfilled.

Problem description:
While heavy discing this spring the hydraulic oil became over heated, per the dash panel gage. Powershift did not malfunction at all during the overheat. Realized the excess heat may be because of the overfill so I drained the excess. About 5-6 gallons.
Now the RPS delays engagement into 1st or Rev. gear when the "inching pedal" (clutch) is let up. When it finally engages it does it too-fast and hard especially if the throttle is up a little. The trans pressure gage shows too low (in the red) during the delay but jumps to green when it engages. Also, intermediate (2nd) powershift gear won't engage after roll out. Per the gage the oil pressure drops off? But it will engage High (3rd) powershift gear once rolling, if the lever move thru 2nd gear quickly.

Investigation So Far:
Filters are OK, even per the filter pressure gage.
Front & Rear Steering and Remote Hydraulics also work normal.
Oil level is now just above Full with implement cylinders extended. Disc 22 acres of light ground where the machine can pull High (3rd) RPS gear and all was normal. Never overheated or lost oil pressure.

Studied the Service manual and found:
The C1 & C2 clutches are engages for Low RPS gear.
The C1 & C3 clutches are engaged for 2nd RPS gear.
The C2 & C3 clutches are engaged foe High gear.
Now I'm confused because it seems all clutches are operating because Low & High work OK.
I suspect somehow the control circuit must be stuck somewhere.
Any advice guys?

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05-29-2007 18:33:11

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 Re: PowerShift Advice Needed in reply to Jim B., 05-28-2007 08:18:05  
Might check RPS valve closely, clutch modulator poppet, blown/cut gskts. Not normal symptoms for broken bolts in RPS, but I"ve seen some funky symptoms from them. Hyds should be weak in certain ranges also. Plug a gauge in C2, and if its not steady, seal rings on back OF C3 hub are broken


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Jim B.

05-29-2007 19:38:21

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 Re: PowerShift Advice Needed in reply to dwag, 05-29-2007 18:33:11  
dwag, Thanx for the reply & advice.
I haven't yet taken anything apart or performed any pressure tests. Actually, since I need the tractor for spring planting I'd like to continue using it. As I said, it will shift OK if I bypass 2nd gear by moving the powershift lever quickly from 1st to 3rd and it pulls the disks OK.
Do you believe I would be damaging it more if I continue to use it, at least until after planting season?
Do you think overheating could have damaged the C2 seal rings?
Correct me if I'm wrong but doesn't it appear that the C3 clutch is the one not engaging? The way I understand it... the C1 is engaged in both 1st & 2nd RPS gear, C2 is also engaged for 1st and it releases and C3 applies when shifing into 2nd. Seems strange to me that it functioned fully normal until I lowered the oil level down to the Full mark, after the overheat. Even worked OK when the trans temp gage said it was too hot ??

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