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Old 03-17-2013, 10:04 AM
mowisme mowisme is offline
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GD Chariot- hydros seem noisey? normal?

I have a older GD Chariot 61" that runs great BUT..The hydros seem like whinning bit loud when activating levers..some noise while just sitting and running too, but more so when levers pushed. I did rebuild one of the hydros last summer when bearing went out and used more rest of year. I also raised it up in air, opened free-spin valves and ran levers after the pump work was done. Like I said..It is working good just noisey..is this normal? 2200 hours and have 15x50 mobil 1 in system. P.S. I only changed the filter once since rebuil of hydro..new filter/fluid quiet it down? Thanks
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Old 03-17-2013, 11:03 AM
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Restrorob Restrorob is offline
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Gene, Check all hoses/line fittings and make sure their tight, One can suck air without leaking oil.

A filter and fluid change wouldn't hurt since working on a pump previously, If these are Hydro-gears try using the recommended oil;

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Old 03-17-2013, 11:16 AM
mowisme mowisme is offline
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Thanks Rob..

thanks- I'll change it out in spring and get the oil recomended from hydro-gear.
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Old 03-18-2013, 06:35 PM
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BigFish BigFish is offline
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The oil shouldn't be an issue. It should run fine on 15w50 Mobil1. Most do.
I would try changing out the filter again, making sure its sealing, and purge/bleed the system. Sounds like ya have air in the system. Could also be the bypass valves not seating properly. Did you replace the o-ring and backer ring on em ? Check the taper seat area?
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Old 03-18-2013, 07:10 PM
Oldtimer Oldtimer is offline
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Use the eXmark/Toro hydro fluid. It is the best on the market and can be used in all hydros with excellent results. There should be noticeable reduction in the pump noise.

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Old 03-18-2013, 07:45 PM
mowisme mowisme is offline
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thanks folks on all the input. BigFish- I really didn't do anything with the bypass valves. I bought the kit from hydro-gear so I might still have the o-rings needed in it. Can I take the bypass out without taking whole thing apart?
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Old 03-18-2013, 08:35 PM
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BigFish BigFish is offline
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Yes, you'll lose some oil, it helps to disconnect or pinch off the feed and return lines. There should be an O ring and a split nylon/teflon backer ring on the valve stem. You also wanna take a close look at the taper surface, make sure it isn't nicked or gouged.
You can download the repair manual on the Hydro Gear website.
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