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Message: <blockquote data-quote="Bill K" data-source="post: 119261" data-attributes="member: 21200">Hello all, I am new to this forum and this is my first post. I recently purchased a 1990 Bobcat 753. The issues I am having are as follows:I am getting an HP1 code on the BOSS system and the machine shuts off after approximately 45 seconds.If I disconnect one wire going to the pressure sensor next to the hydraulic filter at the rear of the machine, the machine continues to run but I get the following error codes: HP1, HP2 and HP3, the machine stays running and moves forward and reverse as it should but still an issue with the lift and tilt.The other issue I am having is the hydraulic Lift and bucket tilt work intermittently, sometime the lift and tilt goes up and down fast and other times it barley moves.What do the two solenoids on the top of the control valve on the right hand side of the machine do? It appears I only have power to the green wire with the red tracer for the wire going to the forward solenoid with the key switch in the on position. I have disconnected these two plugs from both front and rear solenoids and the lift and tilt work a little better but not 100%This is what I have done so far: I have changed the hydraulic oil filter and the hydraulic oil and the oil is at the full mark on the dipstick.Any and all help would be greatly appreciated, Thank you all in advance, Bill</blockquote>