I have a Deere 250 skid steer (1979) that won't raise the boom. The bucket flips up and down great, it moves forward and

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Customer: I have a John Deere 250 skid steer (1979) that won't raise the boom. The bucket flips up and down great, it moves forward and backwards good. The boom will not raise at all. I raised the boom with no problem. It was left raised for about 5 months (I was in quarantine by the Covid-virus) and when I got to lower the boom, it came down without a noticeable problem. However when I tried to raise the boom it would not go up. It seemed like one side (right) was lacking in hydraulic power. The left side acted like it it was trying to raise but only slamming to the right laterally a few inches not up. Depressing the foot control to raise the boom would only slam it back to the right. I don't understand the reason for this erratic action. There are no leaks in the hydraulic system that I can find. My manuals (parts, technical and operators) don't address such behavior. There is a mention of " boom lock", "boom spool", "port lock" and selenoids. Since I am not knowledgable in hydraulics these items do not explain the reason for their use. Could any of these items cause such a problem? I would appreciate any information that would help me get my machine going good again.
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Equipment Mechanic I'm going to connect you with knows all the tricks and shortcuts.
Customer: How do I get connected with such a person?
JA: Anything else you want the Agriculture Mechanic to know before I connect you?
Customer: I would like to repair this machine myself in order to learn more about these types I problems. I am 91 years old and only use this skid steer around the home, no outside work at all.
Answered by curtis b in 22 mins 2 years ago
curtis b
Auto Mechanic

75,208 satisfied customers

Specialities include: Auto Body Technician, Heavy Equipment Repairs, Heavy Duty Engine Repairs, Brake and Transmission Repairs

Hello! Let's see if we can work together and come to a satisfactory conclusion!

I'm ready.
Do you understand my problem?

The side of the boom that does not raise has leaking or damaged cylinder, where the oil is bypassing in the cylinder. With one cylinder leaking, the oil bypasses and will not let the other cylinder raise the boom. You can test, with boom down, work the boom and figure out which hose on the boom cylinder is pressure in that direction, remove the opposite hose, pressure the boom in the same direction, and watch for fluid from the cylinder, if it comes from the cylinder, that cylinder is bad, if it leaks from the removed hose, the opposite cylinder is leaking internally.

I prefer to start with this email. As I mentioned earlier I am 91 and need the value of writing to refer back to. To further question the problem, why would having the boom raised for such a long time cause this type if problem?
I don't mind the $26 fee, but I need more info to make an intelligent question before paying for a phone call.
I am making a drawing of the cylinders and lines to better figure out which ones are faulty. Can I get back with you when I can visualize the flow of oil?
I made a drawing and see how to determine which cylinder is at fault. I will try to get the correct answer to this theory tomorrow. This will give me more info on the procedure if this doesn't solve the problem. At which time I will contact you by phone to try a new approach.

sure, the boom hoses ,2, leave the control valve, and split off to one end of the cylinder or the other, 4, Becasue they are teed together if one cylinder is bad, it affects the other.

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curtis b
75,208 satisfied customers
Auto Mechanic
curtis b
Auto Mechanic

75,208 satisfied customers



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