Location of solenoid valves on Volvo L20B loader?

[MikeC1962]

Sorry for starting a new thread but since this is a bit of a new problem, I though it would be OK.

So, the original issue was the loader not moving.

After I did some testing, I pulled the fuse / relay board and found a trace that had been destroyed. It when between the forward and reverse relays (pins 30).

Fixed that.

Now I am being told that the unit is blowing fuses when it is in reverse (sometimes right away .. sometimes after 1/2 hour). Works great in forward.

So .... this makes sense since the trace that was destroyed on the board fed the reverse circuit.

My best guess is that either solenoid MA-9Y (reverse direction) or MA-Y10 (direction) are bad or the wiring going to them is shorting (grounding).

I have enough of the wiring diagram to see what feeds the solenoids (X105 wire 3 and X105 wire 4)

My question is where do I find these solenoids?

I assume they are somewhere on the transmission but there are a handful of solenoids there ... which one?

I can pull each connector and trace each wire with a meter till I find it but it would be a lot easier if someone had a diagram showing the locations.

Also does anyone have a part number for these solenoid valves? I am sure I will need to order one.

Thanks so much ..... Mike

 

[MikeC1962]

OK ... been under the tractor all afternoon.

I didn't find the solenoids I was looking for.

Then I remembered seeing two solenoids on the pump (or just before it) just after the motor.

I tried one ... looks like the forward solenoid.

tried the other .... both wires on the harness are shorted to ground.

So, I think I found the problem.

Can anyone confirm the two solenoids on the top of the pump just after then engine are the forward and reverse solenoids?

Thanks .... Mike

 

[funwithfuel]

The opposing solenoids on the pump are fwd and rev. The one on the motor is for high and low speed.

 

[MikeC1962]

The opposing solenoids on the pump are fwd and rev. The one on the motor is for high and low speed.

AWESOME !!!!!!!!!!

I am going to cut the wire going to the solenoid and run a new one over to the connector (pin 3 on 105) ... I just didn't want to do this till I was sure these were the correct solenoids.

Like I said ... they seemed to be correct as one connected to pin 2 (the correct pin for the forward solenoid) and this one grounded out on both sides ... which explains why it blow fuses every time it goes into reverse.

Thanks!

 

[MikeC1962]

DONE AND WORKING!

It was the wire leading from the relay / fuse board to the reverse solenoid that was grounded somewhere.

Lucky for me, he had taken off the reverse horn (said it scared the cows).

I used that wire since it already ran to the back .... spliced it in .. worked great!

Years ago there was 40 dairy farms in the area,

When I moved in about 15 years ago there was 10

Now he is the last one left ... at least this should keep him going for a while longer.

Thanks again!