Some help please on canopy pumps and electrics.
I have here a pump with a green painted motor on top of a green/transparent plastic reservoir on top of an alloy pump body with two hydraulic ports. The motor has two wires one green the other red/green. The motor is marked Siba Electric Camberley. PM300 DC Motor. Lucas Marine.
There are two pairs of green wires coming from the top of the reservoir. I assume these are for control valves. They both sound as if they are working when power is applied.
- · Is this likely to be the pump referred to as the Smiths’ pump?
- · Which of the motor wires should be positive? I assume from the existing wiring that the pump runs in just one direction and flow is controlled by the valves.
The existing wiring has a starter style solenoid supplying the whole arrangement so I’m assuming its signal wire is what triggered operation. Next there is a latching relay which connects to the valves. Operation of the solenoid switches on the pump and sets one of the valves. The next operation will run the pump but set the other valve.
- · So the pump runs but the rams do not move. I’ve cracked the pipe fittings thinking this would bleed the system but nothing.
- · I have tried running the pump in both directions but no difference.
- · Logic says both valves will be closed when the system is off. What I’m not sure of is which valve opens when the ram is moving?
All this may be academic as the owner wants a quieter pump.
- · So which is the best pump to get?
I’m a little concerned that a pump for a convertible roof may be a bit slow as the Nova rams are considerably bigger than those on a soft-top. I’ve also heard that they don’t stay up for any length of time. I fitted a replacement pump on a BMW which had no valves and worked just by reversing the pump however some of the examples I have been looking at on ebay for other makes appear to have valves so may be the better choice.
Bit long winded but I hope someone can help.
Many thanks
Steve