Snowplow Forums banner
1 - 20 of 25 Posts

niteman9

· Registered
Joined
·
316 Posts
Discussion starter · #1 ·
Went out this past weekend for 25 hours and was having issues with my pump. Yes it is slow but I can live with that. But I cant live with having to put the truck in neutral and rev the engine to even raise it

The strange part is I could not identify why it was not working. It will work fine for a while then not work. Later it will start working again.

I Changed the fluid in the pump and lift cylinder but this did not help. I did not drain the angle cylinders. It was to cold out and I need to get back out and push some snow.

When it is not working if you raise the plow by revving the engine then try to raise while idling it will actually drop.

I can get a new pump for $204 and if that is the problem I would be glad to do it. But I have read threads with guys having the same type of issue and replacing the pump and still having the issue.

Also could it be in the valve or some other problem? I have read the cables could need to be adjusted but it it were the cables why work sometimes and not others.

Any advice you can give would be helpful.

I went out today to clean up my driveway and it was fine so not sure what to do.

A little background on the truck and plow. The truck is a 1990 dodge w250 with the 318. I believe the plow was installed when the truck was new. I bought the truck in 1996 with 25,000 miles and it was a US government truck. Appeared to be very well cared for, I now has 35,000 miles on it I have only plowed my own a few neighbors over the years until last year when I started to sub for a company here in town. Last year was only two pushes and this year only 1 so far. This year and last i put about 40 hours on it. In the previous years I am sure I didn't put more than 100 hour total. So I don't think the pump has had that much use. But it is 17 years old.
 
Start by removing the cables at the valve body ( us shaped clips with pins thru them) and manually shuttling the valves all the way in and out. See if you find a difference in operation. If it improves then a cable/ control / bracket adjustment are in order. If not you have a valve body problem if it keeps dropping when you idle the truck.

THIS WILL TAKE TWO TRUSTING PEOPLE unless the guy under the hood doesn't like his face and fingers.

Jerre
 
same Issue

Try putting some belt dressing on the pump drive belt temporary fix ( if ) thats is the problem. Will elimate that problem if that is not the issue.
 
We ran ATF in the plow pumps on my old 83 and our 86. Seems after a few years the pumps would be worn enough that the ATF would be too thin when warm. When cold, the pumps would have all kinds of power and be able to lift and stack quickly. As they warmed up, they lost performance. I switched my truck to tractor hydraulic fluid for the extra viscosity when warm. It worked OK, but cold performance was miserable and it actually caused the pump so much cavitation (when cold) that I had to have it rebuilt.

Not sure what you're usingfor fluid in the system, but I'd try flushing the system and using a good synthetic plow fluid.
 
Fisher also offered a smaller diameter pulley as well as an option. It will give the pump more RPM's and aide in a consistent low flow situation.
 
Discussion starter · #8 ·
Start by removing the cables at the valve body ( us shaped clips with pins thru them) and manually shuttling the valves all the way in and out. See if you find a difference in operation. If it improves then a cable/ control / bracket adjustment are in order. If not you have a valve body problem if it keeps dropping when you idle the truck.

THIS WILL TAKE TWO TRUSTING PEOPLE unless the guy under the hood doesn't like his face and fingers.

Jerre
Jerre,

I checked the cables and no difference. Sometimes it works ok and sometimes I have to rev the engine to raise or angle the blade. This sound like the Valve body or pump. I would guess valve body first. If it were the pump I would thing it would me more consistent. Cold or hot but it is not. Today it was very slow when I first stared (Cold) Then after hours of plowing is started working again. Then I hit a curb with the blade angled and it angled back very easily and cushioned the impact. Then it was slow again. I think I am going to get a new valve. Only problem is the two fisher dealers here are both closed today. Hope I make it through one more night. Going back out at 9:00 pm
 
i fixed a similar issue what i had to do was replace the wires from the batery to the plow because the ground was bad and heating up and while i did that i chaged the batery terminals
 
Discussion starter · #11 ·
Well I went out for 8 hours to clean things up and it worked the entire time. Things sure go faster when you can raise and angle your plow.;)
 
Discussion starter · #13 ·
Is there a seal kit available from Fisher?
I was told no. I pulled the valve apart and cleaned it up and cranked in the crossover relief valve a little. Drained all the fluid out and replaced with new. Well see how it does next time out. My dealer did have a new replacement pump but said he didn't think that was the problem. If is still not working I will go back and pick up the pump.
 
I have the infamous heating issue with my pump. 2 storms ago, I thought I'd try adding a cooler in line. Had one in the barn that was intended for my Bronco's transmission. Put that inline on the return line and things are working much better now. Not perfect mind you, but for the cost of some 3/8" return line and a little bit of time, the whole "rev the hell out of the engine after 1.5 hrs of plowing to lift the blade" thing is gone.
 
Discussion starter · #15 ·
I have the infamous heating issue with my pump. 2 storms ago, I thought I'd try adding a cooler in line. Had one in the barn that was intended for my Bronco's transmission. Put that inline on the return line and things are working much better now. Not perfect mind you, but for the cost of some 3/8" return line and a little bit of time, the whole "rev the hell out of the engine after 1.5 hrs of plowing to lift the blade" thing is gone.
I don't think mine is a heating problem. When I went out yesterday it was acting up right from the start. After several hours it just started working again. I think I will go to the dealer next week and pick up a new pump. They had one they said they would let me have for $180.00.
 
If your plow is lowering while at an Idle then it is a valve problem. If it was a pump problem you would have trouble mostly when it was hot after a lot of use.
Your plow should stay up no matter what the pump has nothing to do with it. Your valve is what holds all the functions from moving when you don't want them to. I would put a new valve in and that should fix your problem.
 
I would try to rebuild the valve first. There are some rubber O-rings in there that fail with age and allow the unit to creep down.
 
Discussion starter · #18 ·
I would try to rebuild the valve first. There are some rubber O-rings in there that fail with age and allow the unit to creep down.
The plow is not creeping down with the control centered. What is happening is if you try and raise it while idling it will actual drop slowly. So the valve is opened to raise the plow but the pump can not supply enough pressure to even hold it up. At least thats what I am thinking.

I cant find a new valve. And I don't want to by a used one and if be now good. Not a good way to make sure they are good.
 
They aren't that difficult to take apart and throw new O-rings into. I'd try it you have nothing to loose.
 
Discussion starter · #20 ·
They aren't that difficult to take apart and throw new O-rings into. I'd try it you have nothing to loose.
I have had it all apart and the "O-rings" were not regular O-rings. They looked like they had a square cross section if you know what I mean. If I had parts thats what I would do. The fisher dealer told me they did not have a seal kit for this valve.

If anyone know what would be needed and/or where to get it let me know. I just don't want to pull it apart and drive all over looking for parts and have it snow while it is apart.
 
1 - 20 of 25 Posts