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hydraulic systems?
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Posted by: dwaldron ®

11/22/2004, 13:07:54

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I have two questions concerning when operating my machine on steep ground:

1. The hydraulic reservoir filler/breather cap allows hydraulic fluid to spill out of the top of the tank. Would an “anti-slosh” filler/breather cap solve my tank spill problem?
2. The machine will run away going down hill. Will replacing my regular flow/steering control valve with a “Load sensing” flow/steering control valve solve this run away problem?







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Re: hydraulic systems?
Re: hydraulic systems? -- dwaldron Post Reply Top of thread Forum
Posted by: maytag ®

11/23/2004, 10:59:49

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What type machine are you operating??  Maytag






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Re: hydraulic systems?
Re: Re: hydraulic systems? -- maytag Post Reply Top of thread Forum
Posted by: dwaldron ®

11/23/2004, 11:26:28

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The machine is a track/skidder I use in logging small diameter timber; brand name is Dalco, made in Wisconsin. It was originally manufactured with mechanical drive and I converted it to hydraulic drive. The system consists of one engine driven gear pump, one 2 spool flow/steering control valve, and two gear type hydraulic track motors.







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Re: hydraulic systems?
Re: Re: hydraulic systems? -- dwaldron Post Reply Top of thread Forum
Posted by: maytag ®

11/23/2004, 12:27:18

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Most all mobile equip. that is hydraulic drive employs a "closed loop" configuration-pump and motor tied directly together with a charge pump feeding both as needed-with this setup run away does not happen.  from what you describe it sounds like you have an open loop system-pump flow being directed to the motors thru a directional valve of some sort.  The run away came be prevented with the use of a brake valve.  When you experience the run away the motors and possibly the pump are more than likely cavitating-not good for long life and reliability.

You might check the tank for a return filter or strainer that has come apart-thats the only time I've ever seen hydraulic fluid come out the top unless it is overfilled.  Maytag







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