torch
Well-known member
Equipment
B7100HSD, B2789, B2550, B4672, 48" cultivator, homemade FEL and Cab
Does your B1750 have power steering?
I can't find a diagram for your particular model, but I'm looking at the hydraulic flow diagram for a B1700 which may be similar. On that model, the oil filter is on the HST charge pump "low pressure" circuit, rather than the suction side of the pump. The discharge from the power steering pump (fed through a priority valve from the high pressure main hydraulic pump) also joins that flow.
The charge pump circuit pressure is limited by a relief valve set to 71psi max. Automotive oil filters regularly handle that sort of pressure and the hydraulic oil filter is basically the same sort of design, so that shouldn't be a problem. However, if the relief valve stuck closed for some reason (eg: frozen moisture) then the potential is there to apply high pressure to that circuit if the loader or 3PH was in use (ie:centre of control valve was no longer open).
I can't find a diagram for your particular model, but I'm looking at the hydraulic flow diagram for a B1700 which may be similar. On that model, the oil filter is on the HST charge pump "low pressure" circuit, rather than the suction side of the pump. The discharge from the power steering pump (fed through a priority valve from the high pressure main hydraulic pump) also joins that flow.
The charge pump circuit pressure is limited by a relief valve set to 71psi max. Automotive oil filters regularly handle that sort of pressure and the hydraulic oil filter is basically the same sort of design, so that shouldn't be a problem. However, if the relief valve stuck closed for some reason (eg: frozen moisture) then the potential is there to apply high pressure to that circuit if the loader or 3PH was in use (ie:centre of control valve was no longer open).