Commercial zero-turn mower hydraulic checks before buying
By My Yard Editorial Team · 7/28/2026
The Quick Answer
Check hydraulic oil color and level, look for weeping at hose fittings, and test both drives on a slope. Hydro rebuilds run $700–$2,000 per side — that's the number that turns a bargain into a mistake.
The Witty Breakdown
Dark, burnt-smelling hydraulic fluid means it's been run hot. Walk away or price the rebuild into your offer.
Uneven tracking — the machine pulling one way at full stick — usually means one pump is weaker than the other.
Step-by-Step Fix
- 1
Inspect fluid: it should be clear amber, not black, and not smell burnt.
- 2
Look for oil film and dirt buildup around hoses and pump seals.
- 3
Test full-speed straight tracking on flat ground, then climb a slope.
- 4
Check hour meter against service records for filter changes.
Pro-Tip / Do Not Do This
Don't buy a commercial mower without running it on a hill. Hydro weakness only reveals itself under load.
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