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Discussion Forum
:

Slow hydraulics

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Jeremy

01-07-2003 18:38:27




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Thanks for the imformation on the type of oil to use, but that did not solve the problem. Made it better, but at 3/4 to full throttle it takes about ten seconds to completely lift a blade. It is smooth and not jerky, just slow! The fluid is full with the rams fully extended accordind to the dip stick. Is there adjustments on the pump. If so where at and how do you correctly adjust it.?.?. If I would have to do something with the pump are there replacements available or do I have to rebuild the one I have? how expensive is this? Where do I get the parts? Any input on this woud be greatly appreciated. Thanks

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Tom Miller

01-09-2003 22:40:15




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 Re: Slow hydraulics in reply to Jeremy, 01-07-2003 18:38:27  
I would check all of the adjustment screws on the pump. I had one that was in between and it caused the rams to slowly lower.



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Dave Grubb

01-08-2003 06:32:36




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 Re: Slow hydraulics in reply to Jeremy, 01-07-2003 18:38:27  
There is an adjustment screw on the forward verticle face of the pump body that should be screwed out. The entire control system should be set for operating in the hold position. How fast do the arms lift if the blade is not connected?



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Sid

01-07-2003 20:46:04




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 Re: Slow hydraulics in reply to Jeremy, 01-07-2003 18:38:27  
Two thoughts hydraulics on my Wd are slow in cold weather until it has been operated a time or two to warm up the oil. Check the side of battery box for adjustments on the hydraulic system. Having the adjustments made for the job you are doing will help to some degree and are both cylinders hooked up to the lift arms? sorry I can not tell you what adjustments to make on the hydraulics but if you could find them on the tractor or in a manual They are pretty simple to make.

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Don

01-10-2003 09:40:43




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 Re: Re: Slow hydraulics in reply to Sid, 01-07-2003 20:46:04  
Ref: WD Hyd. Pump-- There are 3 adjustments on the pump 1. top block hold position valve, this is where your hydraulic lines connect to the rams connect to, and is bolted to the top of the pump body with two 5/16 bolts. The knurled adjustment knob on the front should be turned out all the way until it hits on the end check valve plug. 2. the knurled adjustment screw for the control valves on end of pump next to the engine clutch housing is to be turned out also. 3. The knurled adjustment screw on the bottom control shaft on the bottom of pump, this should be locked into the pump body when not using the traction booster control.

Slow response to hydraulic system is most likely caused by worn or broken parts. The first place to check is after removing the hold position valve on top of the pump. You will see four 3/4 plugs these are the discharge check valves. Remove the plugs and look for broken springs. If this is not the problem you will need to remove the pump, when removing the pump it is best to remove the PTO shift lever and take it out the bottom, when reinstalling insert it from the top. If you remove the pump you will see it is a cam driven 4 plunger pump 3-11/16 and 1-5/16 is for traction boost .
check for: stuck plungers, broken return spring, rollers and pins worn.
This is caused by running low on oil.

I hope this will help you out. If you have further questions e-mail me at Ref: WD Hyd Pump--- there are 3 adjustments on the pump 1. top block hold position valve, this is where your hyd. .lines connect to the rams connect to, and is bolted to the top of the pump body with two 5/16 bolts. The nurled adjustment knob on the front should be turned out all the way untill it hits on the end check valve plug. 2. the knurled adjustment screw for the control valves on end of pump dell@ala.nu.
Don -Retired AC mechanic

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Duey (IA)

01-10-2003 10:27:04




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 Re: Re: Re: Slow hydraulics in reply to Don, 01-10-2003 09:40:43  
Sid,
In addition to Don's instructions, A TIP when removing the hydraulic pump. = When the pump is free from the housing, tip it out enough to depress the cam followers and on the pivot end insert a slightly bent nail under the pivot pin and wedge the follower in the depressed position. Then rotate the pump upside down and it will just about fall out. Reinstall the opposite proceedure. Duey--Another old retired AC Mechanic

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