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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; your Craftsman 917388290 is a 21-inch walk-behind mower and normally does not use a hydrostatic transmission. For riding mowers that do, repairs commonly run from a few hundred dollars for service to $1,300 or more for the transmission, and total replacement with labor can reach about $2,500.
Most “drive problems” on this model are usually in the self-propel system (belt, pulleys, cable, or worn hardware), not a hydrostatic unit. Use the owner's manual to confirm your drive type and the adjustment checks.
Common symptoms that point to a belt or control issue:
- Mower pulls weakly or slows on hills
- Drive works intermittently
- Drive engages only when the handle is held a certain way
- Burning rubber smell from under the cover
- Squealing or slipping noises when drive is engaged
| Repair scenario | Typical parts cost | Typical labor/total cost | Notes |
|---|---|---|---|
| Riding mower: hydrostatic service (fluid, purge, linkage) | $50 to $200 | $150 to $600 | Often fixes “no move” complaints |
| Riding mower: hydrostatic transmission replacement | $700 to $1,300+ | $1,500 to $2,500 | Cost varies by brand and integrated axle design |
| Walk-behind (like 917388290): drive belt/cable service | $20 to $100 | $80 to $250 | Most common “won’t self-propel” repair |
If your Craftsman 917388290 is not pulling itself, these parts are often involved:
- Belt, 21-in 532406712 (worn, stretched, or slipping)
- Husqvarna poulan lawn mower zone control cable 532168552 (out of adjustment, binding, or broken)
- Fasteners and hardware that secure brackets and pivots (loose or missing)
Hydrostatic transmission pricing can sound alarming, but it usually applies to riding mowers. For a walk-behind mower like the Craftsman 917388290, diagnosing the belt and control system first typically saves time and avoids replacing the wrong parts.
You can order replacement parts for your Craftsman 917388290 from the parts list for this model, or search by model number on Sears PartsDirect.
Last updated: February 2026
Should I use 87 or 91 gas for lawn mower?
For the Craftsman 917388290 21-inch 5.5-hp walk-behind mower, we recommend using fresh regular unleaded gasoline (87 octane). Higher octane (like 91) does not add power or improve mowing performance in this type of small engine; fuel freshness and clean delivery matter more. See the owner's manual for fuel-handling and safety guidance.
- Use: Fresh, clean 87 octane unleaded gasoline.
- Avoid: Old or stale fuel; the manual lists stale fuel and water in fuel as common no-start causes.
- Avoid: Fuel stored in rusty or dirty cans; rust and dirt can create running problems.
- Do not overthink octane: Octane mainly affects knock resistance; it is not a “more power” rating.
- Fill with fresh gas from a clean container.
- If the mower sat for a while, drain and refill with fresh fuel.
- Wipe up any spills and refuel only with the engine cool.
- Store the mower so fumes are not trapped indoors; let the engine cool before storage.
| Symptom | Common fuel cause | What to do |
|---|---|---|
| Won’t start | Out of fuel, stale fuel, water in fuel | Refill with fresh gas; drain and replace old fuel |
| Runs rough or surges | Contaminated fuel, dirty fuel container | Replace fuel with fresh gas; use a clean can |
| Loses power | Stale fuel plus heavy load | Refresh fuel; reduce cutting load and check airflow |
Using the right fuel is less about octane and more about preventing varnish, moisture contamination, and debris that can clog the carburetor jets and cause hard starting or power loss. If you are also chasing a no-start issue, inspect the blade area for looseness; a loose blade or broken blade adapter is listed as a possible cause, and the lawn mower blade adapter 581547901 is one of the model-matched parts available.
If you need replacement parts for your Craftsman 917388290, order from the parts list for this model or search by model number on Sears PartsDirect.
Last updated: February 2026
What year is my Craftsman mower serial number lookup?
For a Craftsman mower like model 917388290, the model number does not contain the year. The year is typically determined from the engine date code or a separate product serial/date label, then matched to a month, day, and year format shown in your owner's manual.
On walk-behind mowers, the build date is usually found on one of these locations:
- Engine shroud/blower housing (often a stamped or printed code)
- Engine valve cover area (label or stamped code)
- Mower deck housing (sticker or stamped tag)
- Rear of the deck near the discharge opening
- Handle support area (label on the frame)
Many mower and engine date codes use a numeric pattern that can be read as month, day, year. If your code is six digits, a common interpretation is:
- First 2 digits: month
- Next 2 digits: day
- Last 2 digits: year
| Code | Interpreted as | Date |
|---|---|---|
| 072811 | 07 / 28 / 11 | July 28, 2011 |
Before you lock in the year, we recommend these quick validations:
- If the “month” is 13 or higher, it is not a month/day/year code
- If the label includes words like DOM, DATE, or MFG, use that date first
- If the code is longer than 6 digits, it may include a plant code or batch number
- Compare the date to wear items; for example, a heavily worn drive system may point to an older mower (the belt, 21-in 532406712 is a common wear part on self-propelled setups)
Knowing the correct year helps us match the right parts diagram and avoid ordering the wrong components for your Craftsman 917388290, especially for items that can change across production runs (control cables, belts, and deck hardware).
If you need replacement parts after you identify the date code, you can order from the parts list for this model or search by model number on Sears PartsDirect.
Last updated: February 2026
