Hello dear fellows,
Today I’ve tried to diagnose my hydraulics, early type 1989 (SLS removed), and would appreciate yout input.
I have pulsating hoses and the usual engine speed dependent clicking from the overpressure relief valve.
I have exchanged accumulator (it was finished), low pressure warning switch (it started to leak) and charge switch (on speculation).
So, today I took out the multimeter and started to measure.
Pressure warning switch open after 31 seconds of normal idle from unpressurised system, charge switch opens after 1m20s.
I therefore deem these OK.
So, I started suspecting the charge valve, measured up the electrics to it to be sure it had connection, indeed it has.
Took it out to diagnose it separately.
If I apply 12v across it, it sounds and feels dead, no solenoid action going on, it seems.
If I put my ear to it, I can perhaps hear something very faint, but I confuse it with the sound of the minute spark between the cable shoe and the battery I use as power source.
Does this sound like a dead valve to you?
It uses 0.4 amps when powered and has a resistance of 29.9 ohms.
I tried applying compressed air into the side hole and feeling over the wire screen for blowthrough.
Regardless of it being powered or not, the same amount of air gets through.
So, my conclusion is the charge valve is faulty.
Would you agree with this?
(not even whacking it with a brass hammer helped)
I’m a little confused as I would have expected no compressed air blowthrough in my overpressure situation, that an open passage means return to the oil tank, what’s your take on this?
I’d be very grateful for your expertise on this, before shelling out on a, rather expensive, new charge valve.