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Erickson LM4D (2548?) (Ford cl20?) Hydro pump replacement/pa

I

IA641

New User
Hello,
I have an older (1979?) Erickson LM4D skid steer loader. About a year ago I replaced the Onan motor with a Briggs Vanguard 23 hp motor and things have worked well. Yesterday the machine was being used and abruptly stopped moving (wheels and bucket up/down and tip). I towed the loader out of the way in reverse while the wheel controls were held in reverse to minimize the resistance... While doing this I was able to move the bucket likely from the induced pressure from using the wheel motors as pumps?

That all said, does this seem like the hydraulic piston pump has failed? If so, does anyone have any recommendations for tracking down a replacement pump or rebuild parts?

Thanks!
 
Bob,
It doesn't appear so. With the motor running I can see the shaft spinning on the pump. With the motor off I can grab the coupling by hand and rotate it around and both the motor and hydraulic pump shafts turn.
 
Today I had a chance to yank the motor out. Coupler is fine (female keyed shaft and female splined).

Pump shaft rotates if I put a tool on it and turn. Not a ton of resistance, yet not able to turn by hand without leverage. Should I feel any distinct resistance from the piston pump or should it be about the same resistance for an entire revolution?

Also, if I pull the outlet or inlet side, would I be able to feel a vacuum or push fluid out the outlet if I turn the shaft with a drill? Or will I have to use the motor to make any fluid move?

Thanks!
 
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