Newholland 7840 lift problem

[Colin Elliott]

I have a problem with a new Holland 7840 duel power type manual lift, I’ve no lift arms working, the pump is fine and spools an steering work fine. Can anyone shed some light on this?

 

[daveydiesel1]

Sure its not locked out the way a massey can be if u know what i mean by tgat

 

[TripleSix]

@Nearly

 

[bobk]

Is it flashing 27 at top right of the dash

 

[Sackofnuts]

Don’t they have two pumps on. So the steering would be fine even if the pump for the arms is fudged. I maybe wrong tho

 

[norse]

I had a 7840 sle special with manual linkage that stopped working and it turned out to be a pin that went through the rod just as it goes through through the lift cover,unfortunately I discovered this when I had removed the lift cover

 

[agrimax]

If the pump for the linkage is faulty,would the spools be ok though. Has the auxiliary services valve been turned down beside the seat?
@forblue

 

[forblue]

First as stated if you have external lever on right of seat near the base check if that's been turned, may not be fitted only early models had them,second if hyd lift has been working ok it may be the trailer brake valve seized open this will dump pressure oil, spool valves are fed by combination of main and engine hyd pump's so they can still work even if main pump is knackered flow will be slow, steering is driven from main pump so that can still be ok,check hyd lever linkage.

 

[Colin Elliott]

If the pump for the linkage is faulty,would the spools be ok though. Has the auxiliary services valve been turned down beside the seat?
@forblue

I was told to check the t-handle on right side of seat but no sign of it, thers a hole tho where ther might have been a handle before

 

[Colin Elliott]

Don’t they have two pumps on. So the steering would be fine even if the pump for the arms is fudged. I maybe wrong tho

I could only find a pump at the engine that’s piped to the spools then the main pump at back end but it seems to be piped up to the steering as well as the lift arms

 

[Colin Elliott]

If the pump for the linkage is faulty,would the spools be ok though. Has the auxiliary services valve been turned down beside the seat?
@forblue

I cudnt find a lever beside the seat on this one, yea the spools hav a different pump

 

[Vincent]

Check the linkage under the cab the is a plate that can break its + shaped.

 

[forblue]

If there is a hole it's not fitted, This is what you Might see,read my earlier replies..

 

[forblue]

Have you got these pumps..