Adding hydraulics to truck crane

[davedj1]

I have this truck crane that I built a few years back, it works ok but I would like to get a 12 v dc powerpack to lift and extend the crane.
Here is the crane


I would like to pick up one of these: Surplus Center - 12 VDC 1.3 GPM 2500 PSI SPX SA POWER PACK
If I get the power pack (doesn't have to be the one I linked to but similar), can I use a selector valve and two control valves while switching between circuits electronically? IE the diverter valve would be electronically activated. My concern with using electronic valves is I won't have smooth control of cylinders, I don't want an all or nothing scenario. I want to lift the boom and lower with precision and extend/retract the boom without anything traumatic going on.
Any help greatly appreciated as always.
dave
selector valve: Surplus Center - SAE 8 6 GPM DOUBLE SELECTOR VALVE 12 VDC P15544-2
control valve: Surplus Center - 1/4" BSPP 12 VDC HYDRAFORCE SV08-30 SELECTOR VALVE

 

[Tx Jim]

I have a rd bale spike bed with an electric over hyd system similar to the one you mentioned. I can start/stop my bale spear fairly precisely but not exactly.

 

[J_J]

The pump/motor you posted is for an SA cyl.

It will run at the same speed when you activate the up switch.

You can control the speed of operation somewhat by using a needle valve and regulate the flow.

Surplus Center - 1/4 NPT 5 GPM PRINCE WFC-400 IN-LINE FLOW CONTROL

 

[davedj1]

thanks guys
dave