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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Oliver 1755 air in hydraulics

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Phil Verant

11-26-2006 12:56:49




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Have a 1755 that is getting air in hydraulic oil. The hydraulic piston pump had high case drain. Disassembled hyd. pump found port plate was not sealing and slippers were on pistons. Installed a rebuilt pump. Replaced suction hoses and inspected suction tube in resovior. Replaced hyd filter. Filled with hyd. oil, opened bleeder on suction until oil came out. Started tractor with pressure gage in pump pressure line. As michine ran air bubbles showed up in hyd. oil. pressure is 2100 psi. with no load on pump. With a jump line on hyd. outlets and control on air bubbles in oil increases and notice noise in pump. Noise from air in oil. Did have priority valve apart did notice any problems. Any input would help.

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learned

11-27-2006 09:20:26




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 Re: Oliver 1755 air in hydraulics in reply to Phil Verant, 11-26-2006 12:56:49  
If your tractor is an early unit with with cooler pump on front of engine try removing the drive belt from this pump. If problem goes away it tells you cooler pump is pulling air air either from shaft or possibly from p. s. cyl.



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