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Maintenance
Up/Down System
Maintenance
HD92doc042701
3-19
3
3. Adjust the up/down chain tension as needed. Measure chain tension with the head all the
way to the top of the vertical mast. Secure the carriage with a chain at the top. Find the
chain adjusting bolt at the bottom of the mast, behind the battery box. Adjust the nuts on
the bolt until you can get about 1 1/2" (3.8 cm) total deflection in the center of the chain
with a 5 lb. (2.3 Kg) deflection force.
See Figure 3-11.
DANGER!
Always secure the cutting head with a 5/16”
chain with at least 1900 lbs. working load capacity before
adjusting the up/down chain. The cutting head may fall,
causing severe injury or death.
CAUTION!
Do not over-tension the chain. Over-tensioning
the chain may lead to early failure of the gear reducer.
4. Check the up/down gearbox oil level. Add a synthetic gear oil such as Mobil SHC 634 as
needed. Drain and refill the gearbox with 14 - 16 ounces of oil after the first 100 hours of
sawmill operation. Repeat every 5000 hours or once a year, whichever comes first.
Wood-Mizer offers replacement gear oil in 8 ounce bottles (2 required for complete oil
replacement).
FIG. 3-11