MBW R422 - Manual (Page 9)

- 6 -
2. If the oil is not visible in the sight gauge, add oil as
required. See Fluid Levels for recommended type of
oil.
Changing Percussion System Oil
Refer to Lower Unit Assembly, page 16.
1. Remove the drain plug (#4) above the sight glass (#2)
on the back of the spring box guard (#9).
2. Place an oil drain pan behind the shoe and tip the
rammer back so the handle is on the ground.
3. Elevate the shoe until the lower assembly is
horizontal. Hold this position until the oil is
completely drained.
4. With the handle still on the ground, remove the four
hex head flange screws (page 18, #8) holding the
cover (page 18, #2) to the gearbox (page 18, #4).
5. Remove the cover, the cover gasket (page 18, #3),
and the dowel pins (page 18, #1) from the gearbox.
6. Tip the unit forward and drain any oil into an oil pan.
7. After the oil has drained out, replace the dowel pins,
gasket, and cover and secure with the four hex head
flange screws.
8. Tip the rammer onto it’s face and fill according to the
Fluid Levels section in this manual.
9. Replace the drain plug (#4).