642 arms drop fast

[dill38]

Lift arms will drift down in less than a minute.... If main high pressure relief valve was leaking wouldnt bucket tilt also drift? Additional symptom is when I park it with lift arms down it will lift front wheels several inches off the ground.

 

[Dave1234]

On my 742B, the only thing holding the front wheels down is the weight of the lift arms and attachment. If I park with the lift arms not all the way down to their stops but touching the ground, they will drift down and and in the process allow the wheels to raise up. Not quite what you are asking, but related. It appears that without the weight of an attachment the COG is barely in front of to the centerline of the rear axle, or maybe just behind it. Without an attachment a relatively small hump will tip me on my tail.

 

[brdgbldr]

Lift arms will drift down in less than a minute.... If main high pressure relief valve was leaking wouldnt bucket tilt also drift? Additional symptom is when I park it with lift arms down it will lift front wheels several inches off the ground.

Not sure what you have checked but the first thing I would think is that your lift cylinders may need new piston seals.

 

[Markle]

Lift valve spool seals might be leaking internally, also as brdgbldr said…lift cylinder pistons may leak internally too. Wheels coming off ground, after settling overnight, all my machines do that. No worry.

 

[dill38]

Not sure what you have checked but the first thing I would think is that your lift cylinders may need new piston seals.

Sorry, I should have noted, ALL 3 cylinders have been redone and no exterior leaks on machine.

 

[dill38]

Lift valve spool seals might be leaking internally, also as brdgbldr said…lift cylinder pistons may leak internally too. Wheels coming off ground, after settling overnight, all my machines do that. No worry.

When I say drift down, I mean the arms fall at fast as if your pressing foot pedal down, but the bucket tilt works normal.

 

[Markle]

From my 743 service manual…see pic

 

[ward]

really sounds like to me that you need to rebuild the lift cylinders that the packing internally is bypassing