16
MAINTENANCE SECTION
Always wear eye protection when operating or
performing maintenance on this tool.
Always turn off the air supply and disconnect the air
supply hose before installing, removing or adjusting
any accessory on this tool, or before performing any
maintenance on this tool.
LUBRICATION
Each time a Series 7A Drill is disassembled for repair or
replacement of parts, lubricate the tool as follows:
1. Moisten all O–rings with O–ring lubricant.
2. Work approximately 1.5 cc of the recommended
grease into the Rear Rotor Bearing (15), Front Rotor
Bearing (24) and the Spindle Bearing (40).
3. Work approximately 6 cc to 8 cc of the recommended
grease into the D, H, J, JJ, K or L ratio gear train and
10 cc to 12 cc of grease into the M, N or Q ratio gear
train. Grease the Planet Gear Bearings (30 and 36),
the gear teeth inside the Gear Case (38) and the planet
gear shafts on the Spindle (28) and Gear Head (34).
DISASSEMBLY
General Instructions
1. Do not disassemble the tool any further than
necessary to replace or repair damaged parts.
2. Whenever grasping a part in a vise, always use
leather–covered or copper–covered vise jaws to
protect the surface of the part and help prevent
distortion. This is particularly true of threaded
members and housings.
3. Do not remove any part which is a press fit in or on a
subassembly unless the removal of that part is
necessary for repairs or replacement.
4. Do not disassemble the tool unless you have a
complete set of new gaskets and O–rings for
replacement.
5. Do not press any needle bearing from a part unless
you have a new needle bearing on hand for
installation. Needle bearings are always damaged
during the removal process.
Disassembly of the Gearing
1. For N or Q ratio, loosen the Pinch Bolt (47) and
remove the Dead Handle Assembly (46) and Handle
Adapter (45).
2. Remove the Drill Chuck (44) by inserting the short
leg of a 1/4” hex key into the Chuck and tightening
the Chuck. Rap the long leg of the key sharply with a
hammer to remove the Chuck.
3. Being careful not to distort the Motor Housing (1),
grasp the flats on the Housing in leather–covered or
copper–covered vise jaws with the Gear Case (38)
facing upward.
4. Using a wrench on the flats of the Gear Case, loosen,
but do not remove the Gear Case.
In the following step, be sure to hold the tool over a
workbench so that you will not drop or lose parts.
5. Remove the tool from the vise and, while holding the
tool horizontally, carefully unscrew the Gear Case and
pull it away from the Motor Housing.
6. For D ratio, hold the Gear Case horizontally and
lightly tap the chuck end of the Spindle (28) with a
plastic hammer to remove the Spindle and Drive
Plate (33).
For H, J, JJ, K or L ratio, hold the Gear Case
horizontally and lightly tap the chuck end of the
Spindle (28) with a plastic hammer to remove the
Spindle and Spindle Planet Gear Assemblies (29).
H, J and JJ ratios have a Rotor Pinion (31) and
Rotor Pinion Spacer (32) that may come out with the
Spindle, or they may have remained with the Rotor
(19) when the Gear Case was withdrawn.
For M, N or Q ratio, hold the Gear Case horizontally
and lightly tap the chuck end of the Spindle (28) with
a plastic hammer to remove the Gear Head (34), Gear
Head Planet Gear Assemblies (35), Gear head Spacer
(37), Spindle and Spindle Planet Gear Assemblies
(29). M and N ratios have a Rotor Pinion (31) and
Rotor Pinion Spacer (32) that may come out with the
Spindle, or they may have remained with the Rotor
(19) when the Gear Case was withdrawn.
7. Withdraw the Spindle Planet Gear Assemblies and/or
Gear Head Planet Gear Assemblies from the Spindle
and/or Gear Head.
8. If it is necessary to remove the Spindle Bearing (40)
from the front of the Gear Case, use a pair of internal
snap ring pliers to remove the Spindle Bearing
Retainer (41). Remove the Bearing Seal (42).
9. Do not remove the Spindle Bearing from the Gear
Case unless it is absolutely necessary and you have
a new Bearing for replacement. If you must remove
the Bearing from the Gear Case, stand the Gear Case
on the table of an arbor press, chuck end upward.
Using a brass rod that will enter the front of the Gear
Case, press the Spindle Bearing from the Gear Case.
10. For H, J, JJ, M or N ratios, if the Rotor Pinion
remained on the Rotor when the Gear Case was
separated from the Housing, Withdraw the Rotor
Pinion along with the Rotor Pinion Spacer.
