600 allis forklift

does anybody know what tractor engine they put in this forklift also is it normal for hyd pump to pull engine down when relishing the clutch my sure seams to really load the engine

great-grandpa's wc with picker, 20/35, speed patrol, uc, m crawler, 620, 653 dozer d21 d17 d19

I believe your I600 has a fixed-displacement gear-type hydraulic pump. that means, regardless of what speed it's turning, one rotation of the pump yields the same volume of fluid flow.

A fixed-displacement pump MUST have some place to push fluid, and that fluid MUST be able to return to the tank. The control valves on a fixed-displacement engine-driven pump are referred to as 'open center' design, so that when they're not in a position of 'work', that all fluid coming in from the pump, is redirected back to the tank. If you have a pressure line that is somehow restricted... or one or more of the valves has a problem, that will cause the pump to experience a substantial amount of drag with no apparent load. Having cold, thick, or contaminated fluid will do the same.

If you're starting it outside, on a cold day, then best let it start and assume a moderate idle for a while before cycling the valves, let it circulate fluid for a good long time to warm up what's between the pump and the tank. Once warmed, operating the mast lift and tilt valves back a few times will cause it to grunt for a little while, until the cold fluid in those circulates is changed out for warmer fluid.

Having aerated fluid (air bubbles) will make it work extremely hard (because it's spending lots of energy compressing air bubbles, rather than pushing fluid), and having a suction hose with a collapsed interior will also make it work hard, but I'd make those issues a secondary guess.

You will also find that there are many flavors of hydraulic fluid. My local farm store carries everything from ISO 15 to ISO 68... thin fluids flow easily, and transmit power well, provide lower drag, but can slip through worn seals easily. Many guys will deal with a leaky system by using a heavier oil... this results in higher flow restriction, more static load, and slower warmup time. Someone may have gone to heavier fluid at one time, if so, and you drain it and replace with thinner fluid, you may find a few leaks you didn't have before.

Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.

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Bob (IN) Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 06 Jan 2015 Location: SE IN Points: 296	Post Options Post Reply Quote Bob (IN) Report Post Thanks(0) Quote Reply Topic: 600 allis forklift Posted: 23 Feb 2015 at 9:49pm
	does anybody know what tractor engine they put in this forklift also is it normal for hyd pump to pull engine down when relishing the clutch my sure seams to really load the engine
	great-grandpa's wc with picker, 20/35, speed patrol, uc, m crawler, 620, 653 dozer d21 d17 d19

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DiyDave Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: Gambrills, MD Points: 53847	Post Options Post Reply Quote DiyDave Report Post Thanks(0) Quote Reply Posted: 24 Feb 2015 at 5:33am
	A 600 should be a series 2 D-15 motor. As for the clutch drawing down the motor, have you considered that the TO bearing is bad, or dragging?

DaveKamp Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Apr 2010 Location: LeClaire, Ia Points: 6045	Post Options Post Reply Quote DaveKamp Report Post Thanks(0) Quote Reply Posted: 24 Feb 2015 at 7:06am
	I believe your I600 has a fixed-displacement gear-type hydraulic pump. that means, regardless of what speed it's turning, one rotation of the pump yields the same volume of fluid flow. A fixed-displacement pump MUST have some place to push fluid, and that fluid MUST be able to return to the tank. The control valves on a fixed-displacement engine-driven pump are referred to as 'open center' design, so that when they're not in a position of 'work', that all fluid coming in from the pump, is redirected back to the tank. If you have a pressure line that is somehow restricted... or one or more of the valves has a problem, that will cause the pump to experience a substantial amount of drag with no apparent load. Having cold, thick, or contaminated fluid will do the same. If you're starting it outside, on a cold day, then best let it start and assume a moderate idle for a while before cycling the valves, let it circulate fluid for a good long time to warm up what's between the pump and the tank. Once warmed, operating the mast lift and tilt valves back a few times will cause it to grunt for a little while, until the cold fluid in those circulates is changed out for warmer fluid. Having aerated fluid (air bubbles) will make it work extremely hard (because it's spending lots of energy compressing air bubbles, rather than pushing fluid), and having a suction hose with a collapsed interior will also make it work hard, but I'd make those issues a secondary guess. You will also find that there are many flavors of hydraulic fluid. My local farm store carries everything from ISO 15 to ISO 68... thin fluids flow easily, and transmit power well, provide lower drag, but can slip through worn seals easily. Many guys will deal with a leaky system by using a heavier oil... this results in higher flow restriction, more static load, and slower warmup time. Someone may have gone to heavier fluid at one time, if so, and you drain it and replace with thinner fluid, you may find a few leaks you didn't have before.
	Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.

Bob (IN) Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 06 Jan 2015 Location: SE IN Points: 296	Post Options Post Reply Quote Bob (IN) Report Post Thanks(0) Quote Reply Posted: 24 Feb 2015 at 1:06pm
	thanks dave did replace all suction hoses and cleaned strainer replaced hyd oil with new 10 wt hydrolic oil
	great-grandpa's wc with picker, 20/35, speed patrol, uc, m crawler, 620, 653 dozer d21 d17 d19