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Lower Unit Disassembly
NOTE: The lower unit can be separated from the drive
unit (engine, gearbox and handle) without completely
disassembling the rammer. If the lower unit has not
already been separated, follow the “Gearbox
Removal” instructions.
Refer to Lower Unit Assembly, page 16.
Shoe and Springbox Guard Removal
1. Remove the six socket head cap screws and
lockwashers (page 18 #11 & #12) that secure the
lower unit assembly (page 18 #5) to the shoe (page
18 #6).
2. Remove the shoe.
3. Lift the springbox guard off the springbox and ram
head assembly.
4. Remove the o-ring (#9) from the springbox guard.
Springbox Disassembly
WARNING
Working with compressed springs! Failure to
follow the next set of steps very carefully could
result in injury or death.
1. Flip the springbox assembly upside down.
2. Insert the springbox tool (MBW #06468) rods into the
springbox assembly as shown in Figure 3.
3. Make sure the rods are 180° apart.
4. Place the washers over the rods and run the nuts
down so the washers are snug against the cover (#1).
5. Remove the flat head socket screws (#18) holding
the cover to the springbox.
6. While holding the bottom of the rods from turning,
slowly and evenly back off the nuts on the cover side.
7. After the tension is removed from the cover, the
springbox tools and the cover can be removed.
8. Remove the o-ring (#2) from the cover.
9. The lower springs (#13 & #14) can be removed from
the springbox (#11).
10. Place a drift pin or steel rod through the piston hole in
the ram head (#16). Use this to hold the ram head
from turning while removing the hex head cap screw
and lockwasher (#20 & #21).
11. Remove the washers (#7), piston (#8), spacer (#10),
and upper springs (#13 & #14).
Lower Unit Assembly
WARNING
Working with compressed springs! Failure to
follow the next set of steps very carefully could
result in injury or death.
Refer to Lower Unit Assembly, page 16.
1. Turn springbox (#11) up side down and insert the
upper springs (#13 & #14).
2. Install the ram head (#16) and add the washers (#7),
the piston (#8), and the spacer (#10).
3. Apply medium strength thread locker to the hex head
cap screw (#20) and install it, along with a lockwasher
(#21), into the ram head. Torque to 50 ft lbs (68 N•m).
4. Insert the lower springs (#13 & #14).
5. Lightly grease the o-ring groove in the cover (#1) and
install a new o-ring (#2).
6. Insert the springbox tool (MBW #06468) rods into the
springbox as shown in Figure 4.
7. Slowly draw the cover down onto the springbox by
alternately tightening each rod.
WARNING
Keep the cover level with the springbox.
8. Secure the cover with three flat head socket screws
(#18) torqued to 8 ft lbs (11 N•m).
Figure 3
Figure 4
