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7045 Power shift issues
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rfunk1929 View Drop Down
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Joined: 03 Jun 2024
Location: Bloomville N.Y.
Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rfunk1929 Quote  Post ReplyReply Direct Link To This Post Topic: 7045 Power shift issues
    Posted: 03 Jun 2024 at 8:15am
Looking for some insight for my power shift valve on a A/C 7045. Tractor runs great drives great and all gears work until it gets warm. after that have no 1st or second gear. 3rd up work great. Guessing Maybe bad seal in powershift valve but cannot for the life of me find a breakdown for seals. 
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20183 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 9:44am
No seals in the PST valve to blow. There are two sandwich gaskets, but I've never seen one of them fail on that transmission. A black 7000, yes. Not a 7010 and up. I don't have my service book in front of me, but it sounds like a tractor with a ton of hrs on it. The seals on the clutch pistons could be hard and not sealing when the oil is warmed up. Pressure checking each of the six clutch packs cold and hot would be a plan to see what in Sam Hill is going on. Especially the clutched that affect 1st and second gears.
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rfunk1929 View Drop Down
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Joined: 03 Jun 2024
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rfunk1929 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 12:13pm
I will try that. I had a feeling it was an oring leaking by some place. Was weird only for first and second to go out at the same time and same temp.
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8070nc View Drop Down
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Joined: 21 Mar 2019
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Points: 498 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8070nc Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 1:15pm
This is question for my own information. Ive had 5 powershifts. Still got 2. If testing shows leaking in those clutches and the higher gear clutches are ok will it damage more if you just dont use 1 and 2. I hope im clear with my question
1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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rfunk1929 View Drop Down
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Joined: 03 Jun 2024
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rfunk1929 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 1:36pm
From past experience starting out on the higher gears puts more strain on the higher clutch you start out in. eventually wearing that one out.
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Points: 793 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bigal121892 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 6:07pm
Originally posted by 8070nc 8070nc wrote:

This is question for my own information. Ive had 5 powershifts. Still got 2. If testing shows leaking in those clutches and the higher gear clutches are ok will it damage more if you just dont use 1 and 2. I hope im clear with my question



You only do that, to get it home, and in the shop.
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DrAllis View Drop Down
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Points: 20183 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 6:34pm
The problem appears to be in the B-1 clutch. First speed is A-2 and B-1 clutches and second gear is C-1 and B-1 clutches. So, B-1 is the common link between the two speeds that aren't working when hot. I suppose there could be something wrong with the B-1 plunger in the PST valve, but I wouldn't know what it was. Maybe loose internal hardware on the valve itself ?? The B-1 clutch is the most forward located clutch and doesn't rotate and is inside the front half of the transmission housing itself. Should be a test port on the right side of the trans housing for testing. Around 185 to 200 lbs pressure. Compare pressure to other clutches. 
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rfunk1929 View Drop Down
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Joined: 03 Jun 2024
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rfunk1929 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jun 2024 at 6:33am
Thank You for the reply's. I will check into it as soon as I have some down time. 
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rfunk1929 View Drop Down
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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rfunk1929 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jun 2024 at 6:37am
Is B1 clutch only for 1st and 2nd gear?
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DrAllis View Drop Down
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Points: 20183 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jun 2024 at 6:39am
YES.   I'd have to look in my service book, but B-1 could also be for the transmission "Brake" along with "C-2" clutch applied simultaniously.

Edited by DrAllis - 06 Jun 2024 at 6:54am
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