On A 1996 vintage fisher insta act plow I have fluid coming from the breather on the side of the pump housing

Likely air imulsfying oil via a leak. Could be a hose, fitting, or cylinder seal. Wash away excess oil with a pressure washer, raise plow, shut off and wait. Should drip oil if dropping in just a few minute. Trace leak.

Those flat looking bolt heads on the base of the motor/pump are filters replace them and the fluid as well then bleed the air out. I hope this helps, take care.

make sure fluids not contaminated water mixes with it then freezes. if ok check relays for green corrosion and tight connections

bad relay loose connections -loss of hydraulic fluid seized pump

2002 Fisher Minute Mount Inst-Act Wont Angle [Archive] - PlowSite ...

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Nov 17, 2011 - 90 posts - ‎9 authors
My plow went up it was jerking and did it in steps , but , it got there . Now , it onlyjerks when i try to angle it right or left or up . I filled the fluid ... Drop it and if it doesn'traise you can just use a jack and shorten the transport chain to hold it. .... I do havecontinuity on the plow side for all 3 wires going to the plug . Hooking Up A Fisher Minute Mount 2 In Under 1 ...
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Ultramount Intermittent Angle Problem - Snow Plow Forum - L

• Oil viscosity is dropping as oil warms up. Check that plow stays in up position. If plow creeps down than a leak by the piston seal or manifold valve is likely.
• Check for contamination in tank. Suspect pump has worn and is loosing pump efficiency. Metal particles in tank are an indication pump is failing.
• There may be a repair kit available. Make sure that system is completely clean.
• Only use pump manufactures recommended fluid.
• Install a pressure gauge on pump.
• There is a pressure relief valve in the system. Ck if contamination is holding it open or spring/valve seal is bad.

There solinoids on pump. Check wiring and grounds. Make sure all small wires are intact and in good condition. But most likely there's a loose corroded or green wire causing issue

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

does the pressure release close to raise the plow?

did you try cleaning the solenoids for the plow? i think this would solve your problem