gazzer Posted September 20, 2012 Share Posted September 20, 2012 Hi, I have a problem with a Muirhill A5000 Mk 3 Loader, the steering will not follow and starts to crab steer, I have replaced the ram seals and the three change over valves, can anyone point at something that may cause this problem? Quote Link to comment Share on other sites More sharing options...
private mw Posted September 20, 2012 Share Posted September 20, 2012 hi welcome to the forum the experts will be along to help later after the clubhouse bar closes ! :-) Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted September 20, 2012 Share Posted September 20, 2012 (edited) Hi, I have a problem with a Muirhill A5000 Mk 3 Loader, the steering will not follow and starts to crab steer, I have replaced the ram seals and the three change over valves, can anyone point at something that may cause this problem? I did a lot of repair work on these when they were in service with the Army. I thought the later Mark did not have the crab steer facility, but memory might be playing tricks. Just found some course notes on the Muir Hill, dating back to 1980 ... where has time gone? Steering irregularities caused by worn or faulty change over valve are :- 1. Rear wheels will not stay in the straight ahead position when two wheel steer is selected. 2. Rear wheels do not steer to full left or right lock when four wheel steer is selected. To me the changeover valve has to be at the root of the problem. Just looked at your post again, you mention 3 change over valves, I thought this was one unit. I can now recollect there were two types of valve set up dependant on the Mark. Ah, just thought of something else, if rams have been removed then perhaps wheel alignment has been upset (toe in). Edited September 20, 2012 by Richard Farrant Quote Link to comment Share on other sites More sharing options...
private mw Posted September 20, 2012 Share Posted September 20, 2012 you come out of the bar early then richard Quote Link to comment Share on other sites More sharing options...
shane.c Posted September 20, 2012 Share Posted September 20, 2012 Welcome, Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted September 20, 2012 Share Posted September 20, 2012 you come out of the bar early then richard Yeh, only a quick one tonight :beer: Quote Link to comment Share on other sites More sharing options...
stevenivers Posted September 20, 2012 Share Posted September 20, 2012 Welcome to the forum Quote Link to comment Share on other sites More sharing options...
gazzer Posted September 21, 2012 Author Share Posted September 21, 2012 I did a lot of repair work on these when they were in service with the Army. I thought the later Mark did not have the crab steer facility, but memory might be playing tricks. Just found some course notes on the Muir Hill, dating back to 1980 ... where has time gone? Steering irregularities caused by worn or faulty change over valve are :- 1. Rear wheels will not stay in the straight ahead position when two wheel steer is selected. 2. Rear wheels do not steer to full left or right lock when four wheel steer is selected. To me the changeover valve has to be at the root of the problem. Just looked at your post again, you mention 3 change over valves, I thought this was one unit. I can now recollect there were two types of valve set up dependant on the Mark. Ah, just thought of something else, if rams have been removed then perhaps wheel alignment has been upset (toe in). Many thanks for your reply, the steering is heavy and the rear wheels go out of line with the fronts and the machine crab steers, there is no adjustment to the rams they are set, when two wheel steer is selected its fine it steers in a straight line. I have replaced all three of the change over valves which are located under the drivers floor Would you consider the orbital steering box, or the steering hydo pump be at fault, low pressure etc? Do you know were I may obtain a work shop manual, or a drawing of the hydraulic steering system? Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted September 21, 2012 Share Posted September 21, 2012 Many thanks for your reply, the steering is heavy and the rear wheels go out of line with the fronts and the machine crab steers, there is no adjustment to the rams they are set, when two wheel steer is selected its fine it steers in a straight line.I have replaced all three of the change over valves which are located under the drivers floor Would you consider the orbital steering box, or the steering hydo pump be at fault, low pressure etc? Do you know were I may obtain a work shop manual, or a drawing of the hydraulic steering system? Hi mate, The adjustable rams were on early models, sorry for confusion there. Now, I have a schematic diagram of a Mk2 steering circuit, not sure if it is identical to a Mk3, too long ago since working on them. It has Orbitrol unit. To my mind Mk2 diagram suggests it is a spool valve with one selector control, and I recall it was a simpler set up than the Mk1. on a Mk2, for interest; Pressure relief valve, non adjustable and set at 1750psi No idea about a manual, the army workshop manual was in the EMER system, but as the machine was also sold in civilian market, might be worth advertising in the Plant & Machinery magazine. Quote Link to comment Share on other sites More sharing options...
richy 2 times Posted April 3, 2013 Share Posted April 3, 2013 i remember the muirhill A5000 back in the 80,s. my dad was in the REME NRPS in brighton with 583 EOD SQD RE (V). it was a nice bit of kit, 01 HV 83,remember it well. Quote Link to comment Share on other sites More sharing options...
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