Mc Connel PA35 boom wont go down.

[JLLM]

All the other functions work, if I let the arm down a bit by loosening a pipe then it will go back up ok, electric spools, any suggestions?

 

[hampshire-farmer]

Dirty contacts in the switch box. Take the cover off and clean contact points with emery cloth

 

[davidroberts30]

All the other functions work, if I let the arm down a bit by loosening a pipe then it will go back up ok, electric spools, any suggestions?

restrictor on the ram?

 

[JLLM]

Dirty contacts in the switch box. Take the cover off and clean contact points with emery cloth

I think the box is ok as you can see the pipe to the pump flex when you work the switch either way.

 

[kevindb880]

Shouldn’t be going up or down until the end of August!!! Haha Bloody stupid rules!

 

[Bury the Trash]

give the solenoid a carefull tap, it might just be stuck.

 

[Laggard]

Check wires on boom solenoid, one of mine had come loose ltoday and had the same problem.

 

[JLLM]

restrictor on the ram?

Swapped the pipes round and that swapped the symptoms round, so i guess its the solenoid or the spool.

 

[Monty]

Sounds like the check valve could be broken in the spool block. Had this on our our pa95 a couple of years ago. Page 52, part 12 the little pins on the end of the actuator like to snap off and jam. Easy enough get to and look at. Parts 5-11 are all in one piece so won't all fall apart when opening up. Otherwise dodgy electrics or solenoid. A multimeter and swapping the wires/solenoids over should be able to diagnose whats wrong there.
http://dealerinside.mcconnel.com/dealerinside/Parts/PDFManuals/pdf/Manuals/Power Arms/Power Arm 35 Operation & Parts Manual (1986 version).pdf