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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Drott Skidloader

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Dr. Walt

12-05-2012 21:39:28
12.2.223.79



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Sounds like one of two possibilities; First, check to make sure that someone hasn't switched the "raise" & "lower" lines at the control valve. Second, check the "over-pressure" relief valve on the "Lift" side of the control valve; if someone has had the valve apart & forgot to put back the check-
ball or spring,the Hyd. fluid would by-pass the lift side of the valve.




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tpmx

12-06-2012 06:32:58
24.144.152.76



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 Re: Drott Skidloader in reply to Dr. Walt, 12-05-2012 21:39:28  
The lines are correct, they are prebent steel lines at the valve so its hard to get those reversed

There is one large spring loaded valve which i believe would be to set pressure on the entire system

It is in the top side of the valve on the pressure side

The only other one is the one that is in the lift spool itself

That on i am not sure of its function

Another has stated its possibly a regeneration plunger

Possibly a relief valve on the lift spool

It connects the lift port on the spool to another port if it were to open

I have that spool back at to look at it again

The plunger seat looks good plus the seat surface on the plunger seems ok

You can see a wide line where they have been making contact

I put the plunger back in the spool with its return spring and filled that cavity in the spool with a light oil to see if it leaked pass the plunger and it does not

This leads me to believe the plunger does seat

The next thought is if the spring is too weak with age

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tpmx

12-06-2012 17:02:13
50.51.180.233



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 Re: Drott Skidloader in reply to tpmx, 12-06-2012 06:32:58  
Well today at work I remachined the plunger seat,

Hand lapped the plunger to the seat and made a small .125 shim to tighten up the plunger spring.

i put it all back together tonight and still the same thing.

I started now moving the prebent lines over to the extra spool.

I was afraid they would never have enough play in them to move but seems they will.

I will post what happens next.

I will know if the problem is internal in the valve or not.

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