| Author |
Message |
Usher (162.40.199.109)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 18, 2001 - 11:47 am: | |
I have a /59 4104 that has been converted to a 6V71 and V730 transmission. After driving (short or long trip, it doesn't matter) and shutting down, the power steering pump will puke out fluid all over the air compressor. What a mess. I have changed the oil, cleaned the little brass filter (I guess that is it's function) in the return line, checked for over/under fill and talked with a hydraulic repair station. Nothing has helped. I heard there is suppose to be a filter under the cap, but the local truck parts supplier is no help. Any ideas? Is there a valve in the pump to eliminate high pressure backwash at shutdown? |
Len Silva (Lsilva) (209.208.29.45)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 18, 2001 - 6:56 pm: | |
I don't know that much about hydraulics but I wonder if you might have air in the system. My theory being that the air is compressed while running and pushes the fluid back when the pump stops. Just a hunch!
Len Silva |
Luke Bonagura (Lukeatuscoach) (63.15.64.5)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 18, 2001 - 10:37 pm: | |
Good Evening:
Len Silva brings up a good point about an air bound system.
As I have said at others times, this is like going to the Doctor & unfortunately there is more info. required in order to prescibe the proper medicine for your problem.
You mention that you have done an engine change over. Is this new and now you have the problem???
Additionally, what steering do you have in front of the bus??? The original ram style or was it converted to Sheppard. And finally, what pump are you using??? I hope you see the posibilities here of where your problem lies.
Namely if the engine change is new and you have mismatched steering gear & pump you may have created your own problem.
Vickers pumps have a pressure relief valve built into them and I understand that your leak is from the pump and not the resevoir. And now that I think about it a bit more, air in the system should be release at the resevoir. And once again is it compatible with all of the other components in the steering system???? When the bus is shut off, there should be no pressure left in the system.
My guesss (and that is all it is) is that you may have mismatched components. The problem in my mind is that you have a potential safety problem for yourself and others on the road.
Answer me on the Board and I will do my best to help.
LUKE @ US COACH |
Jim Wilke (205.188.192.23)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 19, 2001 - 12:18 am: | |
Hi Usher. Your problem sounds just like how my stock '59 4104 power steering acted when I was refilling it after overhauling the steering cylinder. I was filling the system, and the fluid was a froth of air & fluid. (pink) I made the mistake of shutting off the engine for some reason. As soon as I did the fluid came blowing back out of the reservoir which was open for filling. What a mess! Mine was fine when I went through the procedure for filling & bleeding shown in the book. I had to jack up the whole front end & turn it back & forth from side to side, not hitting the stops. While doing this, do not let the reservoir get too low or you will have to start all over again. Let the engine idle until the fluid in the reservoir is at the correct level and is mostly free of bubbles. I think this took about 1/2 hour all in all. After this I had no more problems. BTW, I think the filter is in the pressure line, not the return.
Jim-Bob |
Usher (162.40.195.60)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 23, 2001 - 9:40 am: | |
I have the original steering ram. The pump is the stock pump that came on the 6V71. I changed out a 6V71/manual trans. with a 6V71/auto. Used the same pump on the "new" 6V71. I had the ram rebuilt. I have run the bus several hundred miles, adding fluid and such at every stop. I have not tried to bleed the system as you describe, but did try to bleed it by turning with the wheels on the ground. I guess I need to get out the jacks and give it a go, and enlist the help of my wife to work on it.
Thanks for the input. BTW, why after installing new steering axle tires am I getting a bump-bump-bump when turning to the right? Toe in is correct. On a really straight smooth road I can feel a slight bump-bump in the steering wheel when straight and level. |
jim wilke (205.188.199.22)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 23, 2001 - 10:16 pm: | |
Well, I would suspect either a bad tire or bad wheel bearing. Easier to check the tire first. I'm assuming you drove the bus at least 1/2 hour at about 60mph to warm up the tires & it was still there. I have new radials in front and I still get some "square tire" behavior for about 1/2 hour or so. When you have it jacked up, spin each front wheel and look for side to side or up and down runout. Sometimes you will find an out of round (up & down runout)tire & you can have it trued (they cut the tread surface while the tire is mounted on the vehicle.) & fix it. I think you will find the culprit is on the left 'cause the weight goes onto the left tire in a right hand corner.
If you can't tell me with authority that your wheel bearings are O.K.,then you need to pull 'em, clean, inspect, replace as needed reinstall & adjust 'em. Do all 4 corners! I know it's a nasty, unglamorous job but you wouldn't tow a boat trailer across the country without knowing what the condition of the bearings was, so why would you drive a 25,000lb 40+ yer old bus without checking. God knows when they were maintained last.
By the way, when I did mine, I found that 5 out of the 8 bearings were very badly deteriorated, with big chunks of metal out of rollers & races. And they did NOT go bump, bump, bump.
When I took the dual rear tires off, I also found a leaky wheel seal had contaminated the brakes on that side. Look for a darker, greasy stripe on the wheelwell which lines up with the space between the duals.
Jim-Bob |
Usher (162.40.203.103)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, May 24, 2001 - 12:28 pm: | |
I did the procedure for bleeding the air out w/ the wheels jacked up. Drove the unit about 50 miles and parked it.. No puking... what a relief. Thanks for the input. It helped greatly. |
Jim Wilke (152.163.206.178)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, May 24, 2001 - 9:04 pm: | |
Hey, that's great that it was something simple & cheap.
Now....what about those wheel bearings??? |
Usher (162.40.203.112)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 29, 2001 - 10:12 am: | |
Well, now that I have my daughter graduated from high school, maybe I'll have enough time to pull the wheels and pack the bearings. If you happen thru NE Georgia in the next few days and would like to help me out with this little project, drop me a line. I know where the is the great fishing hole...... |
Jim Wilke (199.181.167.68)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 29, 2001 - 12:05 pm: | |
Usher I would dearly love to help you. But right now, I have my '04 jacked up at all 4 corners, all six wheels off, replacing all the suspension air bellows. I also am swapping out the driveshaft and replacing the differential seal. While I am under there I will adjust the rear brakes and I found out yesterday that the left spring brake doesn't lock up the brakes for some reason, hopefully just adjustment but I bet otherwise. I was going to run the nylon tubing for my levelling system but that'll have to wait. We have a trip to go on this Friday!
But I'll take a raincheck on the fishing, tho...
Jim-Bob |
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