Figure 41
1.
Vent/Fill plug
3.
Drain plug
2.
Check plug
3. Make sure oil is up to the bottom of the check plug
hole in gearbox (Figure 41).
4. If oil level is low, remove vent/fill plug from top of
gear box and replenish oil as required.
5. Install plugs.
Changing the Gearbox Oil
Service Interval:
After the first 50 hours
Every 500 hours
The gearbox is filled with 80W–90 gear oil or equivalent.
1. Clean debris from vent/fill plug and drain plug to
avoid contamination (Figure 41).
2. Remove the vent/fill plug to relieve air draw.
3. Position a drain pan under the drain plug and remove
the plug.
Note:
The high viscosity of cool oil will extend the
drain time. (approximately 30 minutes)
4. After the oil is completely drained, reinstall the drain
plug.
5. Fill the gear box with high quality 80W-90 gear lube.
Use the following chart to determine the gear box
oil capacity.
Model
Gear Case Capacity
SR48
2 quarts (1.9 liters)
SR54
2 quarts (1.9 liters)
SR54–S
2 quarts (1.9 liters)
SR70
2 quarts (1.9 liters)
SR70–S
2 quarts (1.9 liters)
SR72
4 quarts (3.8 liters)
SR75
4 quarts (3.8 liters)
6. Install the vent/fill plug.
7. Check the oil level and replenish as required.
Inspecting/Adjusting the Drive
Chain
Service Interval:
Before each use or daily
Every 50 hours
Check the drive chain for damage and correct
adjustment. The chain should have approximately 1/2
inch (12.7 mm) of overall deflection (1/4 inch [6 mm] in
each direction).
Chain tension can be adjusted by slightly loosening the
main jam nut and tightening the jam rod to desired
position (Figure 42 or Figure 43). Do not adjust the
chain tension when the chain is hot or warm.
Figure 42
Models SR54, SR54–S, SR70, & SR72
1.
Drive chain
3.
Jam rod
2.
Jam nut
31
