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Topic: Hyd. pump noise
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Joe

12-08-2002 12:11:55
65.160.204.36
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I get a terrible screaming noise when I start my tractor when its very cold out. The noise comes from the front mount hyd. pump. for the loader. After it warms awhile the noise goes away. The pump is in good shape flows normally and comes up to full max pressure ok. I use the very common Ford hyd. pump oil (I forget the number at this time) but it is suitable for low temps. My tank holds about $75.00 worth of the oil and it is fairly new. I think I need to thin the oil a bit more for low temp. operation... What do you think? And if so, with what? Thanks.....

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Alton

12-10-2002 14:49:21
64.4.102.40
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Re: Hyd. pump noise in reply to Joe, 12-08-2002 12:11:55  
It could be cold oil bypassing the pressure relief if it is in the pump. You can tell this by plumbing in a pressure gauge on the outlet side of the pump. A lot of equipment manufacturers recommend a 3 to 5 minute warm up at low engine speeds in cold regions. If it operates normal after warm up it shouldn't be anything wrong with the pump. Any good quality Universal Tractor Hydraulic Fluid should be ok. I don't recommend thinning but use a different weight for cold weather than hot weather. Vane pumps tend to be a little noiser the gear pumps. I don't know what kind of pump you have.

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Joe

12-11-2002 15:05:50
65.160.204.36
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Re: Re: Hyd. pump noise in reply to Alton, 12-10-2002 14:49:21  
It is a vane pump. The safety is located on the loader control valves (located by the operator) and the noise is from the pump at the front of the engine. In fact in order to quiet the pump within a few minutes, I max. in or out one set of loader cylinders to hold the safety in its lift position to warm the oil. Otherwise it can scream and chatter for a half hour or more if the loader isn't used hard to warm the oil. I tend to think it is worse to let it scream for a long time, but I could be wrong...........

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Joe

12-10-2002 13:53:31
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Re: Hyd. pump noise in reply to Joe, 12-08-2002 12:11:55  
My pump is a older Vickers vane type, and the system strainer in the tank is new. The pump is spec'ed at about 13gpm the strainer about 30gpm which I think should be about right for cold weather operation. The hyd. fluid is ford 134a. I'm thinking about putting a heater in the tank so I don't ruin the pump.......

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RickB.

12-09-2002 15:47:25
205.231.148.88
5790



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Re: Hyd. pump noise in reply to Joe, 12-08-2002 12:11:55  
How old is the suction filter? If the oil is new and the filter is old, The filter is probably the culprit.

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dab

12-08-2002 18:13:29
205.188.208.170
5784



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Re: Hyd. pump noise in reply to Joe, 12-08-2002 12:11:55  
What tractor, what pump, what loader, how cold, for sure what oil (makes a difference)?

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charles

12-09-2002 08:17:14
195.12.29.156
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Re: Re: Hyd. pump noise in reply to dab, 12-08-2002 18:13:29  
I have exactly the same problem;When cold ie. freezing (just) the pulley driven pump on my massey ferguson forklift (a french conversion of an MF35) a buzzing noise when not loaded and vibration felt with a hand on the pump for the first 5 minutes of running, after that perfect running .Just changed the hydraulic oil(was contaminated)
Can I just keep an eye on it ,or are we looking at imminent mechanical carnage?
Many thanks in advance
Many thanks from London (England)

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david

12-09-2002 11:16:03
205.204.242.23
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Re: Re: Re: Hyd. pump noise in reply to charles, 12-09-2002 08:17:14  
Generally a buzzing sound would be a relief circuit opening (safety valve) to relieve high pressure. High pressure would be caused by cold oil, water contamination, dirty filter or intake screen. Generally speaking if it is cold oil operate at low speeds until oil warms to operating temp to prevent oil starvation at the pump. Also, generally speaking, if the pump is damaged you will know it pretty soon, if it hasn't been don't worry about the "past". There are arctic oils which are similar to Dextron III ATF. This is a red base stock which will cause you much unhappiness if you are using a brown base stock oil and the system is not well cleaned. Because of the "thinness" of the oil you can expect more internal leakage at the pump, seal weeping, and if you have been using an R&O base oil lots of loose dirt in the system as the detergents clean things out. A compromise is to use Tractor Hydraulic Fluid (I happen to like Multi trac by Coastal but any THF should be ok from the same color base as what you are using). Drianing system and filling with THF will give ou a good compromise. Expect more seal weep in hot weather. I run THF in all my self contained systems. Used to use R&O in them and THF in the transmissions. Accidentally mixed them in a self contained system and created a "green, gelatinous mixture which attacked rubber o-rings and plugged up the works. Got it cleaned out and now only use one fluid in everything. Did sell my powershift tractor b/c I prefer a red base stock fluid in them.

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