Does anyone have a parts number for the steering gear pump for a GM 4905? That is where my steering gear came from on our 4106.
The pump that is on the 8-71T is a Vickers ATM-42. This pump may be a mis-match for the Sheppard steering box. Anyway I will be installing a new pump and I would like it to match. The pressure relief valve on the ATM-42 dumps at 1750 psi and the manual for the Sheppard box requires operating pressure of 2000 psi. Maybe I am shooting into the dark but I have to solve my steering problem.
Don
Don,
The part number 2030977.
However, the operating pressure of the 4905 system is 1450-1550psi with the relief valve opening at 1500psi(+ or - 50psi). This from the 4905 manual as well as the Sheppard conversion for GMs manual that Gary Dean put together many years ago.
Bob
Thanks Bob
That information also helps. My 8V71T came from a Grummon Flxible transit so I do not know what the rating of the pump is(Vickers ATM-42). I do know it is not putting out much pressure. Sheppard manual shows a test tool that I might have to invest in. It is for testing pressure and flow. The max pressure is 2175 psi not operating pressure. First I will look into replacing the pump.
Don
If the pump is off a Gurmun/Flx it is 2000 max psi at 2300 rpm and the relief valve setting is 1700 psi according to the book, maybe not enough oil flow it is a 5 gpm flow and 4 gpm controlled flow pump I don't know what the GM's require
The GM is spec'd at 3.5gpm minimum to 4.5m maximum. Before I replaced the pump, I would pull the relief valve and check for trash or a weak spring. You should be able to do that without removing the pump.
Bob