8030 hi low
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=208566
Printed Date: 18 Oct 2025 at 11:38pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 8030 hi low
Posted By: BenHD
Subject: 8030 hi low
Date Posted: 17 Oct 2025 at 10:24pm
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Having trouble with my 8030 kicking itself out of hi side on the power director...I believe it's electric because right before it happens the radio speaks will pop...any insight would be appreciated
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Replies:
Posted By: DrAllis
Date Posted: 18 Oct 2025 at 7:37am
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The Power Director valve is behind the batteries. The valve normally is in the LOW side. To shift to HIGH side, there is an electric coil on the P.D. valve that, when activated, does the spool shift to high side. To activate the high side coil, you send a signal from the steering wheel shift lever to a relay (I think) in the electrical fuse panel. There is also a clutch pedal switch that keeps it from shifting into HIGH side unless the clutch pedal is 100% fully up. So, make sure the clutch pedal is fully up, as this is the first place to look. The switch is the same switch as used for the safety start switch clear back to the 100 series in the 1960's. This switch first, the fuse socket or shift relay second and a 40 year old shift coil getting hot and tripping the breaker would be next. My question would be, when it does this downshift, can you immediately make it upshift back to HIGH side?? If you can, I doubt that it is the coil getting hot. If there has to be a cooling period, then that changes things.
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Posted By: Lynn Marshall
Date Posted: 18 Oct 2025 at 7:53pm
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You might check the wires on the power through stud. It is an insulated stud on the front of the fire wall. It transmits the 12 volt power from the batteries into the cab. If the wires got loose, it might momentarily drop power in the cab and cause the power director to kick out of the high side.
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