2n hydraulics revisited

boler76 · May 16, 2020

well today I was able to do more tests, with lift arms down connected 360# weight, lift
would not raise it but raised with help of external lift, and then removed external lift it
stayed up even after engine shut down, looking into the side insp hole saw no signs of
leakage running or stopped, lift goes up and down normally with no load and stays up
overnight with no load???? Thanks

Jim L WA · May 16, 2020

I'm not an expert, but from what I've learned from my 2N and reading on this forum it sounds like your lift cylinder is good. But perhaps the pump is weak.
If you can obtain a pressure gauge (2000 lbs.) you can connect it to where that plug is in the right front corner of the pump base. With the engine running at about 1500 rpm and your 350 pound load you should see 1500-1700 psi. This according to the I&T manual.

TheOldHokie · May 16, 2020

(quoted from post at 13:38:19 05/16/20) well today I was able to do more tests, with lift arms down connected 360# weight, lift
would not raise it but raised with help of external lift, and then removed external lift it
stayed up even after engine shut down, looking into the side insp hole saw no signs of
leakage running or stopped, lift goes up and down normally with no load and stays up
overnigouht with no load???? Thanks

Sounding more and more like a weak pump.

TOH

boler76 · May 17, 2020

well an update on the 2n weak hydraulics, I have removed the pump and the first and only thing I see so far is that the spring on the control valve is in 3 broken pieces, could that be the only problem?? I have not taken anything apart in pump yet thanks

R Geiger · May 17, 2020

I would have done a pressure check before I removed the pump. But then I don't like removing the pump!

boler76 · May 17, 2020

I just took it for granted that since there are no leaks that there must be low pressure??

TheOldHokie · May 17, 2020

(quoted from post at 10:43:08 05/17/20) well an update on the 2n weak hydraulics, I have removed the pump and the first and only thing I see so far is that the spring on the control valve is in 3 broken pieces, could that be the only problem?? I have not taken anything apart in pump yet thanks

Good chance of that. If the intake/exhaust spool is semi-floating I can easily imagine unpredictable hydraulic control. Cross your fingers, fix the spring, and put it back in and see. My money is on success.

TOH

Jim L WA · May 17, 2020

The broken spring may be the problem, but since you have the pump out I would go through it and at least make sure everything else is working as it should. Overhaul kits are available. The pump is 75 years old give or take. Unless it's been overhauled in the past it's probably time.

TheOldHokie · May 17, 2020

(quoted from post at 12:15:36 05/17/20) I just took it for granted that since there are no leaks that there must be low pressure??

That would be my assumption as well.

TOH

2n hydraulics revisited

boler76

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Jim L WA

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TheOldHokie

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boler76

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R Geiger

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boler76

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TheOldHokie

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Jim L WA

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TheOldHokie

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