1809 Century Avenue, Grand Rapids, Michigan 49503-1530, U.S.A.
Telephone: (616) 241-1611 / Fax: (616) 241-3752 109-C00
E-Mail: blackmer@blackmer.com / Internet: www.blackmer.com Page 4 of 4
4. Remove the twelve hex-head cover capscrews (112).
NOT
E: The gearcase cover is located on the gearcase with
two (2) dowel pins (38). These pins remain in the gearcase.
5. After the capscrews have been removed, insert a wedge
between the projecting lugs on the gearcase cover and
tap lightly until the cover loosens and can be removed
from the casing.
6. Remove the cover gasket (111).
7. The pinion & shaft (input shaft) (102) is a one-piece
assembly and does not come apart. If necessary, the
bearings (24A) can be removed from the shaft with the use
of a bearing puller or arbor press.
8. To remove the gear (101) and bearings (24) from the
output shaft (125), use a gear puller or arbor press. Support
the assembly on the gear and press the shaft out of the
gear and one bearing only. The second bearing must come
off in the other direction because of the shoulder on the
shaft.
OIL SEAL REPLACEMENT
1. To replace the oil seal (104A) on the input shaft, it is only
necessary to remove the closure plate (114). Once the
plate is removed, the old seal can be pressed out and a
new one installed. Grease the lip of the oil seal before
installing. The oil seal must be inserted such that the lip of
the seal will face inward when the closure plate is
reattached to the gearcase cover.
2. To replace the oil seal (104) on the output shaft, it is
necessary to disassemble the body and cover assembly
and remove the output shaft. (Refer to “Reducer
Disassembly.”) Grease the lip of the oil seal and insert it
into the bearing bore of the gearcase so that the lip of the
seal faces inward.
REDUCER ASSEMBLY
Before reassembling the gear reducer, clean each part
thoroughly. Wash out the bearing bores and remove all burrs
or sharp corners with a file.
NOTE: Disregard steps 1 and 2 if the shaft and bearing
assemblies have not been dismantled.
1. The output shaft (125) has a stepped shoulder where the
gear must be located.
a. Before installing the gear and bearings, remove all
dirt, burrs, or sharp corners from the shaft to prevent
galling or seizing of the gear and shaft.
b. Apply a coat of graphite, molysulphide, or white lead
to the shaft.
c. Press the short end of the shaft (125) squarely into the
bearing (24), and install the spacer ring (82).
d. Align the gear key (124) with the notch in the gear,
and press the gear (101) squarely onto the shaft.
e. Add a spacer ring (82) and press the second bearing
(24) onto the shaft.
2. Prior to installing the bearings, follow steps 1a and 1b. To
assemble the input shaft (102) (Pinion & Shaft), press a
bearing (24A) onto each end of the shaft.
3. After the shafts, gears and bearings have been
assembled, apply a light film of oil in the bearing bores of
the gearcase to help the bearings slide into position.
4. If the oil seal (104) has been removed from the gearcase,
it must be replaced prior to reassembly. Refer to step 2 of
“Oil Seal Replacement.”
5. To install the shaft assemblies into the gearcase it is
easiest to tip the gearcase so that it is resting on the
bracket studs with the cavity opening upward.
a. Start the output shaft (125) into the bearing bore of the
gearcase.
b. Align the bearings and gear teeth of the input shaft
(102) with the output shaft and drop the two shaft
assemblies together into their respective bearing
bores.
NOTE: It is important to line the bearings up squarely with
the bores in order for them to drop smoothly into place. If
the bearings are positioned correctly in the gearcase, the
shafts should rotate freely when turned by hand.
6. Once the input and output shaft assemblies are properly
installed, set the cover gasket (111) on the gearcase.
7. Position the cover on the gearcase using the dowel pins
for alignment.
8. Install and tighten the cover capscrews (112).
9. Make sure the oil seal (104A) is inserted in the closure
plate (114) before reattaching the plate to the gearcase
cover. Refer to step 1 of “Oil Seal Replacement.”
10. Attach the closure plate gasket (115) and the closure
plate (114) to the gearcase cover
TROUBLESHOOTING
NOISE AND VIBRATION
POSSIBLE CAUSES:
REMEDY:
1. Worn or damaged bearings. Replace bearings.
2. Inadequate lubrication / use of wrong
lubricant.
Check oil condition. The lubricant may not be getting to the contact areas of the
gear teeth, or the viscosity of the oil may be too low for the operating
temperature (see “Lubrication”).
3. Impurities in the lubricant, such as
abrasive particles.
Replace with clean oil (see “Lubrication”)
4. Excessive overloading.
Overloading causes overheating which may lower oil viscosity and thus cause
the oil film on gear teeth contact surfaces to break down. The gears will begin to
“groan” as the oil loses its effectiveness. If the loading is not decreased, the gear
teeth will begin to “bite” into each other and wear out rapidly.
5. Misalignment to either pump or motor. Recheck alignment and adjust as necessary.
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