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d restorer 
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Joined: 04 Jan 2017
Location: VT
Points: 24
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 Topic: 600 Forklift
Posted: 04 Jan 2017 at 8:57am |
My Allis Chalmers forklift hydraulic pump gave out, does anyone have any info on this pump? It looks to me like the d17 or 170 tractor shares the same pump by photos but im not sure.  My forklift is a AC 600 all terrain, and has been great, I plan on restoring it soon. I picked this up as it was going to the scrap yard, I changed the gas and fluids and it ran for 2 years with no problems. I used it to build my new 7000sqft building where I will be restoring machines and cars.
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DiyDave
Orange Level Access
Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 50833
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Posted: 04 Jan 2017 at 5:40pm |
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If the 600 matches any parts, in the farm line, it would be a D-15 (II). You didn't say where the pump is. I think the construction models had aux front pumps, for live hydraulics. Not sure if the underbelly pump was used...
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JohnCO
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Joined: 11 Sep 2009
Location: Niwot Colo
Points: 8992
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Posted: 05 Jan 2017 at 2:31pm |
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My 621 has a rear pump (front on the forklift). Pump stops when the clutch is in. I don't know the brand but it should be an off the shelf model. By saying it gave out, do you mean got weaker or just suddenly quit? If just quit, it could be the drive shaft in the pump or from the transmission. I would unbolt the pump and see if it turns by hand. In either case, the pump may be rebuild-able, although often it's cheaper to buy a new one. Good luck. BTW they are great forklifts!, I don't know how I got along without mine.
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"If at first you don't succeed, get a bigger hammer"
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Eric B
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Joined: 09 Feb 2012
Location: British Columbi
Points: 900
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Posted: 05 Jan 2017 at 4:43pm |
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If the pump sits on the right side of the torque tube it should be the same as the I600 backhoe or an H3/HD3 bulldozer.
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Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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orangeman
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Joined: 12 Sep 2009
Points: 1715
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Posted: 06 Jan 2017 at 9:30am |
Many of the H series crawlers used a Commercial Shearing Hydraulic pump. There were at least 2 variations for the production period of the H-3 crawler. Take the pump off the machine and go to a hydraulic shop - lots of hydraulic shops found near airports.
If it is a common pump - I'll bet that there is available an new insert for the pump so that it can be return to close to OEM. Another thing to think about is whether or not there is contamination in the hydraulic system that should be flushed BEFORE resuming with the placement of the repaired pump or a new one.
HTH's - Good luck...
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 50833
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Posted: 06 Jan 2017 at 6:06pm |
ID the pump, for GPM, Flow, Pressure, mounts, and then go to surpluscenter.com. They gots lots of pumps, reasonably priced... 
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d restorer
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Location: VT
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Posted: 07 Jan 2017 at 10:14am |
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This pump is a duel type, one half feeds the fork hydraulics and the other for power steering which was getting weak then just stopped working, the forks work good. when taking the pump apart I found a lot of heat marks where the pump ran dry at times, when I had no steering, it was a very cold day up here in northern Vermont, I think that finalized it.
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d restorer
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Location: VT
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Posted: 07 Jan 2017 at 10:18am |
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Orangeman
Thank you for that, I never new, im going to look into crawlers and construction equipment.
I flushed the system and new filter.
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Eric B
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Joined: 09 Feb 2012
Location: British Columbi
Points: 900
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Posted: 07 Jan 2017 at 11:58am |
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There is generally a screen in the plumbing somewhere just ahead of the supply side of the pump. Make sure that screen is thoroughly cleaned before using a new pump. The fact that the old pump seemed to have been starved for oil is very serious. Unless you were revving the engine upon cold start up it should not have been running dry as long as you had proper volume in the hydraulic tank. That said, excessive wear in a pump can have the appearance of dry running even though they always had oil.
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Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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orangeman
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Joined: 12 Sep 2009
Points: 1715
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Posted: 07 Jan 2017 at 1:16pm |
D Restorer- The Allis Chalmers 615 Loader Backhoe was designed with stacked pumps similar to what is on your forklift. If memory serves the stacked pump design provided for 25 GPM fluid flow which was found to be too fast for the backhoe operation. The hydraulic pump design on the 700 series was changed so the backhoe swing movement would not be so fast.
From discussion with retired AC Industrial engineers it was found that the dual pumps at 25 GPM would cause an excessively fast swing movement - thus lots of stress on the outboard final drive wheel assembly.
PM me if you need more info. on the pump overhaul.
Good Luck - Orangeman
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