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Post by Derek M on Sept 18, 2014 21:48:00 GMT -6
I have an F Toy that is hard to turn while sitting still. At first thought the cylinder was too small or that the orbital was going bad. Cylinder is sized correctly and orbital is checking out good. The pump is an allstar brand and is pretty new so ruling that out. But as I was playing around in it today, everytime it was hard to turn is when it was at a stand still. Always figured it was because the tread was gripping too well aposted to when it was rolling and it having less resistance. Then it hit me, an allstar pump comes with a 6" pulley on it for high rpms, so then everytime it was hard to turn at a stand still I put it in neutral and bumped up the rpms and it was way easier to turn. So my problem I think I have now is not enough flow. Only way i can figure to get more is by putting a smaller diameter pulley on the pump.
Anybody see another reason for this or am I going the right direction...
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Post by Somebody on Sept 18, 2014 22:23:13 GMT -6
Nope.. I think your right about the under pulley..
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Post by 06blackmax on Sept 19, 2014 7:04:37 GMT -6
Check pressure at idle and make sure it's at the correct specifications. The relief valve may need to be adjusted for higher pressure at lower RPMs. Could need a shim or stronger spring. I wouldn't rule a pump out just because it's new. I have installed new pumps and it will either be bad out of the box or within hours be weak. Ask allstar about the correct pulley and make sure that it will work for low and high RPMs so when you get into the throttle hard it won't blow fluid out the resivior. Also check your idle and make sure the RPMs are correct. Some lift's I work on won't steer or lift skids because the idle is to low.
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Post by Derek M on Sept 19, 2014 10:46:32 GMT -6
Well last night I emailed all star about a spec sheet on psi and flow vs rpm. Going to probably call them later today. I think the standard on GM pumps is a 5" pulley and all star does a 6" for high rpm applications. Going to try and buy some fittings this weekend to put in a pressure gauge, been wanting to do that anyways. I don't have a tach on it yet, but the idle is about high as it can go before the tranny wants to start pulling. Might as well put one of those in this weekend too.
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Post by Derek M on Sept 19, 2014 13:21:44 GMT -6
Well they just replied to email with this:
We do not have an incremental chart but the pump has a 1300PSI rating and starts working at 1500 RPM pump speed. 3 gallons per minute. Hope this helps…
So I guess when I get home I guess I will me sure the crank pulley and do some math.
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Post by grizzlyadams on Sept 21, 2014 20:27:34 GMT -6
This isn't directly related but on my Duramax I had gotten the wrong pump once. It was for a gas burning truck which idles higher than my diesel. It was near impossible to turn the wheel at idle but bump throttle and it would turn.
That being said if you can get it spinning quicker it should help a lot. I would also check and make sure you aren't loosing pressure somewhere. Bob Preston is not the type guy to put the wrong pump on a rig. He over analyzes everything.
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Post by Derek M on Sept 24, 2014 11:12:34 GMT -6
This isn't directly related but on my Duramax I had gotten the wrong pump once. It was for a gas burning truck which idles higher than my diesel. It was near impossible to turn the wheel at idle but bump throttle and it would turn. That being said if you can get it spinning quicker it should help a lot. I would also check and make sure you aren't loosing pressure somewhere. Bob Preston is not the type guy to put the wrong pump on a rig. He over analyzes everything. I am the same way, my wife hates it. The pump and crank are both about the same size, so if I tried to get the pump around 1500 rpms just above idle and would have to go way down on the pump pulley. I am thinking there is a problem elsewhere because every was often when I do idle it up it is still hard to turn right. Going to swap the lines around and see if it does it then to the left to rule it either being the orbital or ram. |
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Post by mike on Sept 24, 2014 12:34:10 GMT -6
Is it just hard to turn one direction ? If so some of the newer chevy steering boxes had that problem and the solution was replacing it
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Post by N2DEEP on Sept 24, 2014 12:57:24 GMT -6
A whole different animal mike.
Welcome home.
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Post by mike on Sept 24, 2014 17:52:32 GMT -6
A whole different animal mike. Welcome home. Yea... I didn't know Thanks. |
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Post by Derek M on Sept 24, 2014 23:26:50 GMT -6
Is it just hard to turn one direction ? If so some of the newer chevy steering boxes had that problem and the solution was replacing it It's full hydro steering. Had to work late tonight may try and swap them around tomorrow. |
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Post by 06blackmax on Sept 25, 2014 5:51:38 GMT -6
It's easy to tell if the ram is bypassing. Jack it up and turn it full to one direction. Then take the line off the fitting the side the ram is fully extended from and try to turn the SAME direction. If fluid comes out the fitting on the cylinder then fluid is bypassing the seals internally. If fluid comes out the hose that you took off...... you turned it the wrong direction. Oh and don't have the engine running the first time you try this, it WILL make a mess.
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Post by Derek M on Sept 25, 2014 10:56:11 GMT -6
That makes pretty good sense. I will have to try that when I mess with next..
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Just remember...we give them back in 10 months 
It's alive!! 
