Plow issues
Thread Starter
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Cargo Master
Joined: Sep 2004
Posts: 3,430
Likes: 2
From: NH
Plow issues
Ok. so it's the middle of summer but I still try to run the plow truck once a month.
This last time I had trouble lifting the blade.
It's a late 80's Toyota Fisher Minute Mount Plow. Fully hydrolic setup with cables going into the cab for the controls.
Last fall I replaced most of the fluid and the plow worked fine all winter.
When I went to move the truck this last time I has to almost red line the motor to get the blade to slowly pick up and I also had to release and redepress the lever in the up position for the blade to pick up. It works fine side to side but going one direction is faster than the other.
The fluid is a little pink but full.
Other than flushing the system what else could be wrong?
Pump?
Pistons?
Any help apreciated.
Thank you
This last time I had trouble lifting the blade.
It's a late 80's Toyota Fisher Minute Mount Plow. Fully hydrolic setup with cables going into the cab for the controls.
Last fall I replaced most of the fluid and the plow worked fine all winter.
When I went to move the truck this last time I has to almost red line the motor to get the blade to slowly pick up and I also had to release and redepress the lever in the up position for the blade to pick up. It works fine side to side but going one direction is faster than the other.
The fluid is a little pink but full.
Other than flushing the system what else could be wrong?
Pump?
Pistons?
Any help apreciated.
Thank you
Thread Starter
|
Cargo Master
Joined: Sep 2004
Posts: 3,430
Likes: 2
From: NH
Cable is getting full movement on the part under the hood. Spool Valve Block? It moves about 90% of the full travel. I got a screwdriver in there to move it the last 10% or so and still no differance.
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
Then it would seem that all three rams are single acting so on the side shift you should have the same rate of shift left and right. Yet you say it is faster one way than the other. So either the valve block is restricting flow in one side shift direction or the pump is not putting up the proper pressure to overcome a difference in side shift friction.
The valve block will have probably two or three spool valves in it. These are like the valves in an auto trans but operated manually. When pushed one way a valve will allow high pressure fluid to flow to a ram and when the other way it will close off the fluid supply but allow fluid in the ram to flow back to the resevoir.
So it is possible that fluid is leaking across to the dump pipe in the valve block. Maybe bad "O" rings in the block.
However before going down that route maybe put a pressure gauge on the pump output.
The valve block will have probably two or three spool valves in it. These are like the valves in an auto trans but operated manually. When pushed one way a valve will allow high pressure fluid to flow to a ram and when the other way it will close off the fluid supply but allow fluid in the ram to flow back to the resevoir.
So it is possible that fluid is leaking across to the dump pipe in the valve block. Maybe bad "O" rings in the block.
However before going down that route maybe put a pressure gauge on the pump output.
