Hd7g Hd6ec brake control valve
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=46441
Printed Date: 24 Jun 2025 at 2:54am
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Topic: Hd7g Hd6ec brake control valve
Posted By: doctorcorey
Subject: Hd7g Hd6ec brake control valve
Date Posted: 29 Feb 2012 at 6:10pm
Anyone here ever replace inner and outer seals on these. Just looking for some heads-up and any advice on sourcing the seals. Mine were fine 'till I had to remove the spool to service the tranny control valve, and after reassembly they started leaking; probably were dry rotted and didn't like being disturbed. Thanks, Corey Chartier
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Replies:
Posted By: Mactractor
Date Posted: 29 Feb 2012 at 7:20pm
| Minpar is always a good starting point for parts Corey. I`ve never had to replace those on my tractors. When I got my first one with power assist brakes, an old timer advised me to back the relief pressure on those valves way down to less than 100psi (factory setting about 350 I think). He said I would then never snap brake bands which was a common occurance. Have to put a lot more boot power on the pedals when tractor is cold, but once up to operating temp, brakes work just as good. |