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Topic: Hyd air solenoid issue  (Read 536 times) previous topic - next topic

Hyd air solenoid issue

2002 U320 ISM 450

Couldn't build air pressure in both tanks above 60 psi.  Found an air leak from what I think is a purge for the air control for the hydraulic accumulator. Tapping on it seems to make it function ok now and get good pressure. I couldn't find anything on the forums for this.  Anyone with info on this solenoid valve.  FYI. On my way to Albuquerque for over night and maybe find the part. Thanks
Andy & Sue (and Sofie dog) + Lucy dog
2002 U320 4020
# 5959
TOAD 2014 CRV

Re: Hyd air solenoid issue

Reply #1 –
This might help you out:

Allison retarder air valve
Most places won't have one on the shelf. I will have to hunt around and find a part number as I cant remember everything these days.
Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Hyd air solenoid issue

Reply #2 –
Once the solenoid is closed, he should be able to leave the retarder off and proceed without it though, no? Otherwise just cut and cap the line until a replacement can be found. 
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Hyd air solenoid issue

Reply #3 –
Andy,

On an '02 you should need an Allison  # 295-52377

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Hyd air solenoid issue

Reply #4 –
Quote from: Elliott –
1. Once the solenoid is closed, he should be able to leave the retarder off and proceed without it though, no?
2. Otherwise just cut and cap the line until a replacement can be found. 

Correct on both points Elliott

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Hyd air solenoid issue

Reply #5 –
Hey thanks.  Yes, that looks like the retarder accumulator valve. I was searching for the wrong thing. The system has been working fine for the last couple of hours after a little tap tap. We'll see what the morning brings.
  Excellent write up link on servicing the valve.  Google doesn't know what that part is so maybe some phone calls, but I'd rather do the cleaning next week.
Andy & Sue (and Sofie dog) + Lucy dog
2002 U320 4020
# 5959
TOAD 2014 CRV

Re: Hyd air solenoid issue

Reply #7 –
I did finally find it on line, no dash in the number. Looks like it may have been superceded a few times and now could be 29557354.  Price was enhanced along the way too.    :-\
Andy & Sue (and Sofie dog) + Lucy dog
2002 U320 4020
# 5959
TOAD 2014 CRV

Re: Hyd air solenoid issue

Reply #8 –
Went through POs box of spare parts and found this.  Now I know it goes to the retarder valve. 
Andy & Sue (and Sofie dog) + Lucy dog
2002 U320 4020
# 5959
TOAD 2014 CRV

Re: Hyd air solenoid issue

Reply #9 –
That part could be a plunger/seat for a 6 pack solenoid valve so check the size to be sure. They look the same but are different size.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."