Dixon ZTR Ram Ultra 61 Operator's Manual page 58

Action
50-Hour Service
1. Perform the 25-hour service.
2. Clean/replace the air cleaner's filter cartridge (paper filter)
(shorter intervals for dusty operating conditions).
3. Change engine oil.
4. Lubricate according to lubrication chart.
5. Check/adjust the parking brake.
100-Hour Service
1. Perform the 25-hour service.
2. Perform the 50-hour service.
3. Change the engine oil filter.
4. Clean/replace the spark plugs.
5. Replace the fuel filter.
6. Clean the cooling fins on the engine and transmission.
7. Check V-belts.
8. Check/tighten caster wheel axle bolts (every 200 hours).
9. Change the air filter's paper cartridge.
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