Benr8440667
New Member
Hello everyone.
Im newly joined up to the forum but have looked at it many times over the years and found some good info so thanks.
This is somewhat long-winded so please bear with me!
I have joined up as I have a hydraulic issue and have very little experience with repairing such faults.
I have an old towable cherry picker. It is a very basic niftylift type contraption built in the mid 1990s.
The machine is battery powered with a 12v electrical system driving the hydraulic pump.
The pump is operated by pressing a button either in the basket or in the chassis cabinet.
The hydraulic control valves are lever operated spool valves both in the basket and also duplicated in the chassis cabinet where the batteries and the Hydraulic pump are housed.
The problem that I have is that the cabinet lever for the upper boom fails to lower the upper boom.
Everything else works fine, including lowering the upper boom from the duplicated basket lever! (And raising the upper boom using the cabinet lever works fine too)
When I make the selection on the lever the pump can be heard labouring (just like when you select any other input) but no actual lowering of the boom occurs.
There is also a manual emergency lowering valve on each ram which all pipes go through.
I have no experience of such problems and am hoping there will be a clue in my post for somebody more experienced!
Any input much appreciated.
Thanks for bearing with me
Im newly joined up to the forum but have looked at it many times over the years and found some good info so thanks.
This is somewhat long-winded so please bear with me!
I have joined up as I have a hydraulic issue and have very little experience with repairing such faults.
I have an old towable cherry picker. It is a very basic niftylift type contraption built in the mid 1990s.
The machine is battery powered with a 12v electrical system driving the hydraulic pump.
The pump is operated by pressing a button either in the basket or in the chassis cabinet.
The hydraulic control valves are lever operated spool valves both in the basket and also duplicated in the chassis cabinet where the batteries and the Hydraulic pump are housed.
The problem that I have is that the cabinet lever for the upper boom fails to lower the upper boom.
Everything else works fine, including lowering the upper boom from the duplicated basket lever! (And raising the upper boom using the cabinet lever works fine too)
When I make the selection on the lever the pump can be heard labouring (just like when you select any other input) but no actual lowering of the boom occurs.
There is also a manual emergency lowering valve on each ram which all pipes go through.
I have no experience of such problems and am hoping there will be a clue in my post for somebody more experienced!
Any input much appreciated.
Thanks for bearing with me
