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How much does it cost to repair a hydrostatic transmission on a lawn mower?
Hydrostatic transmission repairs are typically a riding-mower cost; the Craftsman walk-behind mower model 917387582 normally does not use a hydrostatic transmission. For hydrostatic riding mowers, repairs commonly run several hundred dollars, and a full transmission replacement is often $1,300 to $2,500 installed, depending on the mower and labor rates. See the 917387582 owner's manual to confirm your drive type and service guidance.
Typical hydrostatic transmission cost ranges (riding mowers)
- Fluid service or leak repair: often $150 to $500
- Drive belt, pulley, or linkage repair (misdiagnosed as hydrostatic): often $100 to $400
- Hydrostatic unit rebuild (when available): often $400 to $1,200
- Hydrostatic transmission replacement (parts + labor): often $1,300 to $2,500
| Repair scenario | What you usually pay for | When it makes sense |
|---|---|---|
| Minor service | Fluid, seals, basic labor | Unit still drives but slips or whines |
| External drive repair | Belt, idler, cable/linkage | Mower will not move but engine runs normally |
| Full replacement | Transmission assembly + labor | Unit is seized, won’t propel, or has internal failure |
How to tell if you actually have a hydrostatic problem
Before pricing a hydrostatic repair, we recommend checking common “won’t move” causes:
- Drive belt worn, stretched, or off the pulleys
- Idler pulley or tension spring not applying tension
- Control linkage out of adjustment
- Wheels not engaging the axle properly
- Debris binding the drive system
A walk-behind mower issue is often a control or hardware problem, such as a stretched/binding zone control cable like the walk-behind lawn mower engine cable 532176556.
Why it matters
Hydrostatic repairs get expensive fast, and many “transmission” complaints are actually belt, linkage, or wheel engagement problems. Confirming the drive design first prevents paying for the wrong repair.
Last updated: January 2026
Should I use 87 or 91 gas for lawn mower?
For the Craftsman lawn mower model 917387582, we recommend using regular unleaded 87-octane gasoline for normal operation. Higher octane (like 91) does not add power in small mower engines; the bigger priority is using fresh, clean fuel and storing it correctly per the 917387582 owner's manual.
What to use (and what to avoid)
- Use fresh regular unleaded 87 octane from a clean fuel can.
- Avoid stale fuel (old gas is a common no-start cause).
- Avoid fuel contaminated with water, rust, or dirt.
- If the mower will sit, use a fuel stabilizer and follow proper storage steps.
- Keep gasoline off finished surfaces and wheels; wipe spills promptly.
Quick comparison: 87 vs 91 for a walk-behind mower
| Fuel choice | What it changes | What we see most often |
|---|---|---|
| 87 octane (regular) | Correct for typical mower engines | Reliable starting and normal performance |
| 91 octane (premium) | No performance benefit in most mowers | Extra cost with no practical gain |
Why fresh fuel matters more than octane
The troubleshooting guidance for this mower family points to fuel quality issues as a leading cause of starting problems (for example, stale fuel or water in fuel). Using the right octane does not help if the gasoline has degraded or picked up contamination.
Fuel storage tips that prevent no-start problems
- Do not store gasoline from one season to the next.
- Replace the gas can if it starts to rust (rust and dirt cause fuel system problems).
- Store the mower in a dry area and let the engine cool before storing.
- If you need help with off-season prep, follow how to winterize a lawn mower.
Why it matters: Correct fuel helps the engine start easily, run smoothly at FAST speed under load, and reduces fuel-system issues that lead to hard starting and poor cutting.
Last updated: January 2026
What model number is a Craftsman 6.75 lawn mower?
A “Craftsman 6.75” label usually refers to the engine series, not a single mower model number. For the Craftsman walk-behind mower covered by our parts list and documentation, the model number is 917387582 (shown on the mower housing decal and in the 917387582 owner's manual).
How to find the model number on your mower
We use the mower’s model number (not the engine label) to match the correct blade, blade adapter, cables, and hardware.
- Look for a decal on the rear of the lawn mower housing
- Record both the model number and serial number
- Use the model number to select correct parts for the deck and handle system
- If the decal is dirty or faded, wipe it clean and use a flashlight at an angle
“6.75” vs. mower model number: what’s the difference?
| What you see | What it means | What we use for parts |
|---|---|---|
| 6.75 (or 6.75 HP) | Engine power/series label used on many mowers | Not enough by itself |
| 917.XXXXXX | Craftsman mower model identifier | Yes, this is the key |
| Engine model/type/code | Engine identification (on the engine shroud) | Only for engine-specific parts |
If you’re trying to match parts for a 6.75 Craftsman mower
Once you confirm the mower model number, we match common wear items like the blade and blade adapter to the correct deck.
- Blade for this model: lawn mower blade 532406713
- Blade mounting hub: lawn mower blade adapter 532418373
- Control cable (operator presence/zone control): walk-behind lawn mower engine cable 532176556
Why it matters
Many Craftsman mowers share similar engine labels (including “6.75”), but the deck, handle, and safety control parts can differ by model. Using the exact model number prevents ordering a blade or adapter that will not fit.
Last updated: January 2026
