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Old 06-20-2015, 10:59 PM
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jlbf0786 jlbf0786 is offline
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Join Date: Jun 2005
Location: Charlotte, NC
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changing Hydro Fluid & filters

So I recently bought a super cheap Snapper Hydro Walk Behind
Model SPA520

I have done all of the engine related repairs, etc.. BUT I had a questions about the Hydro Fluid and Filter.
When I referred to the online manual for this particular mower it says to change the Hydraulic Oil every 200 hours along with the Filter

Question:
Is it necessary for the hydraulic oil (SAE 10W-30) and Filter to be changed for the hydro pumps to function correctly?
In the past I've used 15W-50 Hydro fluid/oil, is SAE 10W-30 commonly used in hydro systems for mowers?
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Old 06-20-2015, 11:36 PM
herler herler is offline
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Quote:
Originally Posted by jlbf0786 View Post
Question:
Is it necessary for the hydraulic oil (SAE 10W-30) and Filter to be changed for the hydro pumps to function correctly?
Yes, even if it does not need it this time, the reason we change it is so that we are 100 percent certain we're doing it right.

Quote:
Originally Posted by jlbf0786 View Post
In the past I've used 15W-50 Hydro fluid/oil, is SAE 10W-30 commonly used in hydro systems for mowers?
I would go with what the manual recommends, bottom line.
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Old 06-21-2015, 01:06 AM
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jlbf0786 jlbf0786 is offline
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Location: Charlotte, NC
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hydro oil

Okay. I've never done a Hydraulic Fluid change so is there any particulars that I should know about when draining the old hydro oil/filter ???
Do I need to run the unit 1st to make the drain process more effective?
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Old 06-21-2015, 01:47 PM
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jkilov jkilov is offline
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Join Date: Apr 2008
Location: MS
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Most hydro systems I have worked on call for 20W-50 but other grades are often mentioned.

Using fluid that's too "thick" can cause the unit to overheat or experience cavitation. Fluids too "thin" on the other hand may not offer adequate lubrication or cause a back-leak effect reducing the max. torque at the wheels.

Locate the model number of the hydraulic unit and look up the user manual on the manufacturer's website.

And yes, it's a good idea to warm up the unit to aid draining.
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Old 06-21-2015, 06:33 PM
Oldtimer Oldtimer is offline
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My advice is to use only OEM filters and one of the best hydro oils available is eXmark hydro oil. The eXmark lazer hydros are warrantied for 2500 hours if the oil, filters and belt are changed @ 250 hours and then every 500 hours after that.

Oldtimer
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