Service bulletin SB-2025-11
Contractor AL S19: reinforced axle service interval
| Bulletin number | SB-2025-11 |
|---|---|
| Issued | 18 November 2025 |
| Models affected | Contractor AL S19 3'n1 (565964), all serial numbers |
| Classification | Scheduled maintenance. Customer pay unless a covered part has failed. |
Background
The Contractor AL S19 runs a reinforced rear axle and a sealed gearbox because it is sold into commercial use. Walk mowers carry the Masport 3-year limited warranty, unless otherwise specified in the related warranty statement, and the interval below is what keeps a working machine out of a declined claim.
Interval
| Every | Do |
|---|---|
| 25 hours | Check drive belt tension and wheel-drive engagement. Clear packed clippings from the axle housing and the pinion window. |
| 50 hours | Inspect the axle bushes for play, check the gearbox for weep at the output seals, grease the height-adjuster pivots. |
| 100 hours or annually | Drive belt replacement, axle bush replacement if there is any measurable play, gearbox oil level check. |
Procedure at 50 hours
- Stop the engine, let it cool, remove the spark plug lead.
- Set the deck to its highest cutting position and remove the rear axle cover.
- Lift each rear wheel and rock it. More than 1.5 mm of radial play at the rim means the bush is worn out; replace both sides as a pair.
- Check the drive belt for glazing and for cord showing at the edges. More than 3 mm of stretch over the free span means replacement, not adjustment.
- Wipe the gearbox output seals dry and run the machine for five minutes. Any fresh film of oil at a seal is a gearbox job, not a top-up.
- Grease the height-adjuster pivots and the axle pivot with a lithium grease. Do not grease the belt side of the pulley.
- Refit the cover and confirm that the wheel-drive engages and releases cleanly at both extremes of the control.
Parts
- Drive belt, axle bush pair and gearbox seal kit, ordered per model from Parts & accessories.
- Model page and exploded view: Masport equipment.
Labour and warranty coding
Flat-rate allowance 0.5 h for the 50-hour inspection, 1.2 h for the axle bush pair. Scheduled maintenance is customer pay. A gearbox that has failed inside the 3-year limited warranty period is a warranty repair: open the claim from Warranty claims, quote SB-2025-11, and state the machine's declared use type. A machine sold for domestic use and then run commercially is excluded.