D14, hydraulic problems
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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=158447
Printed Date: 18 Jul 2025 at 3:32am
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Topic: D14, hydraulic problems
Posted By: 59f100292
Subject: D14, hydraulic problems
Date Posted: 23 Feb 2019 at 10:51am
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I’m going to look at a D14 that’s for sale. It has a loader, from the pictures it appears to be a trip bucket that someone has retrofitted to have hydraulics to roll the bucket. From talking to the seller over the phone, it utilizes only the factory hydraulic pump. He says the hydraulic pump “thumps” now and the hydraulics have gotten slow to move. Any ideas what could be going on here, any possibly simple fixes? Is a pump rebuild complicated or expensive? If I can source a new pump can it be swapped out as a whole unit fairly easy? I’m unfamiliar with the -14, any knowledge is appreciated. |
Replies:
Posted By: DSeries4
Date Posted: 23 Feb 2019 at 11:25am
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All ACs of that era had rather primitive hydraulic pumps that only put out 1.5 gallons per minute of flow and are only single acting. Not ideal for running a loader with a hydraulic bucket. No, a new pump cannot be swapped out either. It is the nature of the beast. Aside from it being low on oil, that is pretty much your only easy fix. If you want a good loader tractor with good hydraulics, look for a Series 4 D17 or a One Seventy - they have much better flow to run a fully hydraulic loader. I love D14s, but not their hydraulic systems. ------------- '49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080 |
Posted By: DiyDave
Date Posted: 23 Feb 2019 at 6:01pm
The older tractors actually had a flow rate of about 4 GPM, at 3500 PSI. When the series 4 D-17 came out, it was a 10.5 GPM at 2000 PSI, to better match up to other mfgr's specs. If the loader has the original cyls, running it with a D-14 shouldn't be a problem... Problems come in, when new style cyls are bodged onto a system not designed for their lower pressure, and higher GPM! Sometimes they use so much fluid, that the tractor reservoir is empty, just from picking a load up, and you simply can't add enough fluid, to the small capacity reservoir, to achieve full extension!
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DSeries4 wrote:Posted By: jaybmiller
Date Posted: 23 Feb 2019 at 6:17pm
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hmm.. I'm wondering if it's low on oil cause the Ram seals or hose for the rear lift (rock shaft) is leaking ? Check oil level( by right foot), with loader up. The diff in 'Troy' here would fill up......!still have no left brake though....one day.... ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: 59f100292
Date Posted: 23 Feb 2019 at 7:46pm
| According to the seller it’s not low on oil. Sounds like it’s not something for me. Decent price though. |
Posted By: DennisA (IL)
Date Posted: 23 Feb 2019 at 8:00pm
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It could be a stuck plunger on the pump. If a plunger is stuck the cam roller will be hitting it making the "thump". ------------- Thanks & God Bless Dennis |
Posted By: 59f100292
Date Posted: 24 Feb 2019 at 7:58am
| What’s the process for unsticking a plunger? |
Posted By: DrAllis
Date Posted: 24 Feb 2019 at 10:08am
| Almost anything that you can do to the pump has to be done after you remove it from the belly of the tractor. After you remove and replace that pump one time, you don't want to do it a second time. Fix it right when you repair it on the bench. I've never seen a stuck pumping piston, but have seen cam rollers destroyed which can damage the clutch shaft. If you remove the pump, completely disassemble it, clean everything, replace all rubber parts, copper washers and any gaskets, replace all small pumping springs, and make sure everything that should be able to slide can do so freely. There are different sized balls throughout the pump, DON'T GET THEM IN THE WRONG PLACE. |
Posted By: DiyDave
Date Posted: 24 Feb 2019 at 6:01pm
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Had the pump go on the D-19d, one of the rollers got spat out of the follower frame. ended up underneath it, with a file, and emory paper, bumping the starter, with the fuel pump off, to smooth out the pump cam...
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Posted By: dt1050
Date Posted: 01 Mar 2019 at 9:13am
you can buy a hub and shaft and mount a pump on the front to run off the crankshaft pulley, then you would only need the other pump when using your 3pt. that's what I did when I had my d14. I simply made a bracket to mount the pump on with some angle I had laying around.  ------------- Just cause it's orange don't make it a tractor, there's only one..Allis Chalmers |