D-17 seat shock absorber
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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=179694
Printed Date: 27 Jul 2025 at 12:46am
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Topic: D-17 seat shock absorber
Posted By: DrAllis
Subject: D-17 seat shock absorber
Date Posted: 08 Apr 2021 at 7:52pm
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I'm thinking someone out there has figured out what p/n shock from an auto parts store can be used to replace the OEM seat suspension shock on a D-17 tractor. I don't want a new spring and such, just the shock absorber. Thanks for any help.
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Replies:
Posted By: Charlie175
Date Posted: 09 Apr 2021 at 6:26am
I had it noted somewhere but a motorcycle shock was a direct fit. I just need to find that.
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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Posted By: PaulB
Date Posted: 09 Apr 2021 at 6:37am
I can't say for a D17, although the front shock for a 49-50 Dodge or Plymouth is an exact fit for a CA.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Posted By: DrAllis
Date Posted: 09 Apr 2021 at 7:02am
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I think the CA is the same as a late WD and WD45's and not quite the same as D-14-15-17-19.
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Posted By: Hunt4Allis
Date Posted: 09 Apr 2021 at 10:48am
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My spring seems to be completely worn out unless I can tighten it somehow because on even small little bumps it bottoms out on my d17 so I'd be interested in this too, among other things that need looked at on her...
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Posted By: DrAllis
Date Posted: 09 Apr 2021 at 11:14am
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If you have the spring/shock adjusted to full FORWARD in the slot behind the seat, and it bottoms out a lot, you have a spring that is old and getting short or you are too heavy. The shock does nothing to carry the load. The spring does that.
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Posted By: Charlie175
Date Posted: 09 Apr 2021 at 11:49am
I purchased a new shock unit early this year for my 17, makes for a much better ride.
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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Posted By: Hunt4Allis
Date Posted: 09 Apr 2021 at 3:31pm
I dought I'm too heavy(225) probably original spring...
Wondered if like a four wheeler suspension that can be more compressed for a firmer ride( less bottoming out)
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Posted By: DrAllis
Date Posted: 09 Apr 2021 at 7:37pm
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I'm pretty sure if you'd invest the $100+ dollars into a new spring/shock assembly, you'd not bottom out near as easily as long as it is adjusted fully FORWARD in the adjustment slot. Coil springs get shorter with age. This also assumes your seat suspension linkage bushings/pins/pivot points are all in good condition.
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Posted By: John D
Date Posted: 11 Apr 2021 at 8:25am
I have used a Monroe 5752 on a couple of D17's I've had. I only needed to modify the collar that holds the spring to allow it go onto the shock housing. My notes have this shock as 8 5/8" compressed and 12 3/4" extended with 5/8" bolt hole. I picked them up from O'Reillys.
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1964 D17 series 3
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Posted By: Hunt4Allis
Date Posted: 11 Apr 2021 at 5:19pm
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The top of mind seems to be missing a bushing where the 5/8 bolt goes through the top hole of the spring it's probably about 1 in in diameter instead of being tight with some kind of bushing I'm guessing...
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Posted By: DrAllis
Date Posted: 11 Apr 2021 at 6:10pm
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Yeah, that would make a difference on you bottoming out. Get the new rubber bushings in there and the bottom ones are probably shot as well.
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Posted By: DrAllis
Date Posted: 21 May 2021 at 8:00pm
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I thought I'd report on the Monroe 5752 shock absorber for a D-17 seat shock. I think I'm going to be happy with it and am going on a tractor ride in a couple of weeks. Price was right at 30 bucks. The overall length is actually a wee bit longer than the OEM shock. This extra length allows the seat suspension to travel noticeably higher when unloaded. This then causes the seat to not sit squarely on the suspension when in the raised up position. I slipped a 1/4" thick plate under the bottom connection point of the shock to act as a stop to cure this minor issue. My new after-market seat cushions are thicker than OEM which also compounded the height problem. For the weight bearing coil spring, the bottom spring cup works just fine. What I used at the top was a schedule 40 piece of pipe that just slipped snugly over the shock that was 4 inches long. It compressed my old spring an inch over the OEM shock, which is what I wanted. At 195 lbs I have the weight setting about two inches from the rear of the adjustment slot, or in other words almost as weak as it can be. My goal was to have the old spring (which is shorter from 60 years of use) compressed tighter to begin with, so as the suspension reaches the bottom of its possible travel, the spring rate increases dramatically to keep from (hopefully) hitting bottom nearly as often. If I do another one (and I may on my next project) I may take a risk and cut off the shocks rod 1/4" or so to try and hit the exact extended length as OEM to control the total max unloaded height.
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