Owner’s manual
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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 917378990 gas walk-behind mower normally uses a belt-and-gear drive system instead of a hydrostatic transmission. For riding mowers, hydrostatic repair costs commonly range from a few hundred dollars for minor service to well over $1,000 for major replacement; confirm your drive type in the owner's manual.
Hydrostatic costs vary most by whether you’re repairing a leak or replacing the entire transaxle.
- Minor service (fluid leak diagnosis, linkage adjustment, basic labor): $150 to $400
- Moderate repair (seals, pulleys, cooling fan, labor): $400 to $900
- Major repair or replacement (hydrostatic transaxle plus labor): $900 to $2,500
On the Craftsman 917378990 walk-behind platform, “won’t move” complaints are usually caused by belt, cable, wheel, or drive-gear issues, not a hydrostatic unit.
Check these common motion-drive items:
- Ground drive belt condition and tension
- Drive control cable operation and adjustment
- Wheel/axle hardware wear or missing retainers
- Drive gears for stripping or binding
If you find belt wear, the lawn mower ground drive belt, 3/8 x 32-1/2-in 532175436 is a common motion-drive wear item for this model family.
| Drive type | Typical repair approach | Typical cost impact |
|---|---|---|
| Hydrostatic (riding mower) | Diagnose leaks, replace seals or transaxle | Higher parts and labor |
| Belt/gear (walk-behind) | Replace belt, cable, wheel parts, gears | Usually lower cost |
If you price a “hydrostatic transmission repair” for a walk-behind mower, you can overestimate the repair by hundreds of dollars. Identifying the correct drive system helps you target the right parts and fixes first.
For step-by-step motion-drive diagnosis, use our lawn mower wont move troubleshooting video motion drive failure.
Last updated: February 2026
What year is Craftsman Model 917378990?
Craftsman model 917378990 is identified in the documentation as a Craftsman 5.5 HP, power-propelled, 21-inch rear discharge walk-behind mower; the model number itself does not encode a build year. To pin down the exact year, we use the date code on the mower’s product label and confirm details in the owner's manual.
Look for the product label on the mower (commonly on the rear of the deck, near the handle mounts, or on the engine shroud). Then check for a serial/date code or a stamped/printed code near the model information.
- Check the mower deck label first (not just the engine label)
- Write down the full serial number and any date code
- Look for a format that includes month/day/year or year/week
- Compare the label info to the model identification section in the manual
- If the label is damaged, clean it gently and use a flashlight at an angle
For many Craftsman walk-behind mowers, the manufacture date is determined from the serial/date code, not from the model number. The exact format varies by production run, so the most reliable approach is to match your label format to the identification guidance in the owner's manual.
| What you see on the label | What it usually means | What to do |
|---|---|---|
| A clear “MFG DATE” field | Direct manufacture date | Record it as the mower’s year |
| A numeric date code (varies) | Encoded date | Decode using the manual’s identification info |
| Serial only, no obvious date | Date may be embedded | Use the manual and parts breakdown to confirm configuration |
The correct year (and sometimes even the production run) helps us match the right parts and diagrams for your Craftsman 917378990, especially for wear items like the drive system and blade hardware.
If you are ordering parts based on the label details, common matches for this model include the lawn mower engine zone control cable 532184588 and the lawn mower ground drive belt, 3/8 x 32-1/2-in 532175436.
Last updated: February 2026
How to find Craftsman model number?
For a Craftsman gas walk-behind mower like model 917378990, the model number is typically printed on a decal or tag on the mower deck (often near the rear discharge area) or on the rear of the deck near the height adjusters. Use that exact number to match the correct parts and manual for your mower, such as the 917378990 owner's manual.
Check these common spots with the engine off and the mower cooled down:
- Top of the mower deck, near the rear discharge chute
- Rear of the deck, behind the engine
- Side of the deck near a wheel height adjuster
- Near the handle mounting brackets
- On a sticker close to the bagger opening (if equipped)
Record both identifiers if they are present; they help ensure the right Craftsman parts diagram and replacements.
| Item | What it looks like | Example for this mower |
|---|---|---|
| Model number | A longer number, sometimes with a dot | 917.378990 (same as 917378990) |
| Serial number | A unique code or number string | Varies by unit |
Craftsman walk-behind mowers can look similar across years, but parts like the drive system, wheels, and control cables can differ. Using the exact model number helps us match the correct items, such as the lawn mower engine zone control cable 532184588 or the lawn mower ground drive belt, 3/8 x 32-1/2-in 532175436.
- Wipe the area with a damp rag first, then dry it
- Use a flashlight at a low angle to make faded printing stand out
- Take a close-up photo and zoom in
- If the sticker is missing, check the 917378990 owner's manual for model identification and parts diagrams
Last updated: February 2026
What is the best self-propelled mower for the money?
For the best value, we recommend choosing a self-propelled mower that matches your yard size, terrain, and maintenance comfort level; for a Craftsman 917378990 specifically, the “best for the money” choice is keeping your current mower cutting and driving like new with the right maintenance and a few high-wear replacements listed in the 917378990 owner's manual.
A “best value” mower is the one that delivers reliable drive traction, clean cutting, and low downtime for your yard.
- Yard size: small yards favor lighter 20 to 21-inch decks; larger yards benefit from stronger drive systems.
- Terrain: hills need strong self-propel drive and good wheel traction.
- Cut quality: look for a sharp, balanced blade and a solid blade adapter.
- Serviceability: common wear parts should be easy to access (belt, wheels, control cable).
- Storage habits: fuel care and seasonal storage practices prevent most no-start issues.
If your mower still starts and the deck is solid, replacing a few wear items usually costs far less than a new mower and restores performance.
| Symptom | Most likely value fix | Example part for 917378990 |
|---|---|---|
| Mower will not self-propel or slips | Replace worn drive belt | Lawn mower ground drive belt, 3/8 x 32-1/2-in 532175436 |
| Poor cut, tearing grass | Sharpen or replace blade | Husqvarna lawn mower 21-in deck 3-in-1 blade 532189028 |
| Drive engagement feels inconsistent | Inspect/replace control cable | Lawn mower engine zone control cable 532184588 |
A self-propelled mower feels “cheap” when the drive system slips, the blade is dull, or the operator presence controls are out of adjustment. Keeping the belt, blade, and controls in spec gives you the same real-world benefit people pay for in a new mower: smoother drive and cleaner cutting.
We follow the same basics outlined for this Craftsman mower:
- Wear eye protection when operating or servicing.
- Stop the engine and wait for the blade to fully stop before cleaning or unclogging.
- Disengage the self-propel mechanism before starting.
- Do not mow wet grass; keep firm footing and walk, never run.
For operating details and maintenance intervals (oil checks, blade service, drive inspection), use the 917378990 owner's manual.
Last updated: February 2026
