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Bradley Martin
Bradley Martin,
Category: Heavy Equipment
Satisfied Customers: 175
Experience:  Field Technician at Thompson Tractor Company
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I have IR VR642b telehandler. The forks will only move 1

Customer Question

I have IR VR642b telehandler. The forks will only move 1 direction,(down) no matter what direction you move handle. Will develop pressure lock from both sides if continue to work valve lever. There are 2 relief valves on the cylinder, I changed the larger 1 out thinking this was my problem, but it didn't make any difference. Any ideas?
Submitted: 1 year ago.
Category: Heavy Equipment
Expert:  Bradley Martin replied 1 year ago.

Have you checked the valve on the crowd and lift manifold?

Customer: replied 1 year ago.
Dont even know what or where to look for this..I have no books or breakdowns for this unit. Where do I look?
Expert:  Bradley Martin replied 1 year ago.

number 3 is the is the valve I am talking about

Customer: replied 1 year ago.
Ok Thanks, ***** ***** this valve and removed relief. Spool inside seems to move freely with slight spring pressure, all o rings seem intact. When I remove both hoses going to the cyl. they both have flow when operating valve, no matter the direction valve is moved.
Expert:  Bradley Martin replied 1 year ago.

Does everything else work but boom up?

Customer: replied 1 year ago.
boom works all directions fine. The fork tilt is the problem. No matter what way valve is operated, the fork tilt cyl moves out(down) I removed both relief valves on the cyl, after installing the cyl seemed to work correctly, but for maybe a second or two, then it returns to only moving out(down)
Customer: replied 1 year ago.
when I stated that both hoses have flow, I mean at the same time. When valve is operated oil comes out both hoses at same time?I'm assuming that the reason cyl goes out is because larger surface area of piston for oil to push against, as opposed to retracting.
Expert:  Bradley Martin replied 1 year ago.

This is the tilt manifold should be some relief valves on it check the seals on them make sure they are not blown

Customer: replied 1 year ago.
I have inspected both reliefs closely. I do notice a slight difference. If I put air to the pilot pressure hole on side of relief, one will move the spool in, the other the spool does not move , also the non moving spool is sitting down in the valve slightly deeper (maybe 1/16th") I believe this difference may be my problem, but dont know which one is acting correctly. It seems that it takes very little air pressure to shift spool on relief that is moving, maybe too little.
Expert:  Bradley Martin replied 1 year ago.

Yes I would replace the relief valve with the non moving spool if it is stuck that is likely causing you fork tilt problem

Expert:  Bradley Martin replied 1 year ago.

Any update today?

Customer: replied 1 year ago.
Just ordered new relief, should know if problem is fixed in a couple days.
Expert:  Bradley Martin replied 1 year ago.

Ok sounds good

Expert:  Bradley Martin replied 1 year ago.

Any update yet?

Customer: replied 1 year ago.
Still waiting for replacement valve