I recently bought a used 1963 Allis Chalmers D17 series 3 tractor. It has a FEL. When I raise the bucket, it slowly comes down at the rate of about 1" per minute. It also doesn't seem to have enough lifting power as I expected it to have for a 54 HP tractor. It's probably safe to say that there is some sort of internal leak somewhere. How do I determine where the leak is? It could be in both the cylinders or perhaps it could be in the pump.
Once I determine the source of the leak, what should my next step be? Can the cylinders or pump be repaired/rebuilt, or should they be replaced?
2007-12-05 06:37:32 · 6 answers · asked by paul67337 7 in Cars & Transportation ➔ Maintenance & Repairs
lift the bucket with a hoist ..one at a time disconnect the rams and plug the ports..then let the weight down on the ram..if it holds the ram is fine.. if it creeps down you have found the trouble..
if both rams seem OK i would rebuild the valve.. very easy
rebuilding rams is so cheap and easy you won't believe it.. as long as the tube is not bent or dented rebuild it..
the pump is a finely machined part ..not rebuildable at home
2007-12-05 06:46:32 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Leaking cylinders and pumps that produce flow are two different systems.
1. Let's start with cylinders. Do not use a hoist to raise the cylinders, but the machine. Raise them all the way up. Safety glasses and pay attention to what is above you. At the valve, gently loosen the hose to the OPPOSITE end of the cylinder that is raising the boom. This should be the rod. DO NOT loosen hose to the base that supports the boom. Due to area differential in all normal cylinders, there is more oil in the base than rod. If the piston packing is leaking, oil will run OUT of the rod side slowly as the boom comes down due to the leak. If it sucks in, the problem is in the valve. Using this method you can determine which cylinder is the worst. On the valve, excess clearance, damage to the spool or bore, or leakage in the port relieve valve will cause this. I would warn you that back then,,Don't ask how I know, you probably still had cast iron sealing rings, verses teflon today. The just did not seal that well.
2. I am assuming that you have an aluminum gear pump. Really not rebuildable. This is speed, and if bad enough you will lose pressure, which is force.
3. Check pressure readings for force.
Good Luck
2007-12-06 02:16:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Your best bet is to contact a hydraulics repair shop and let them do the job, but if you are determined to do this make sure you are not working with the lines under pressure, and you have a hoist or support for the bucket. The problem may be the cylinder or may be the valve(s). The cylinders are easily rebuilt and are the least costly items to work with. The valves are not usually rebuilt, but rather they are just replaced.
2007-12-05 06:49:13 · answer #3 · answered by rex_rrracefab 6 · 0⤊ 0⤋
If there was an internal leak then bucket would slowly be creaping down. If it is moving up slowly I would suspect it has a very slow flow rate for the oil.
You said when you raise the bucket, it comes down slowly? Well, which is it? Are you raising it or lowering it?
2007-12-05 06:45:16 · answer #4 · answered by kdog 4 · 0⤊ 2⤋
I don't think it could be the cylinders. You should get a gauge on the system. It sounds like valves to me, which ones I don't know.
2007-12-05 06:50:27 · answer #5 · answered by abkwire 3 · 0⤊ 1⤋
I suspect there is air in the system or there isnt enough fluid in the system
2007-12-05 07:11:25 · answer #6 · answered by rich2481 7 · 0⤊ 2⤋