1
Torque-Arm
™
II Speed Reducer Backstop Assemblies
Instruction Manual
These instructions must be read thoroughly before installation or operation. This instruction manual was accurate at the time of
printing. Please see
dodgeindustrial.com
for updated instruction manuals.
WARNING: To ensure the drive is not unexpectedly started, turn off and
lock-out or tag power source before proceeding. Failure to observe these
precautions could result in bodily injury.
WARNING: Because of the possible danger to person(s) or property
from accidents which may result from the improper use of products,
it is important that correct procedures be followed. Products must be
used in accordance with the engineering information specified in the
catalog. Proper installation, maintenance and operation procedures
must be observed. The instructions in the instruction manuals must
be followed. Inspections should be made as necessary to assure
safe operation under prevailing conditions. Proper guards and other
suitable safety devices or procedures as may be desirable or as may
be specified in safety codes should be provided, and are neither
provided by Dodge
®
nor are the responsibility of Dodge. This unit and
its associated equipment must be installed, adjusted and maintained
by qualified personnel who are familiar with the construction and
operation of all equipment in the system and the potential hazards
involved. When risk to persons or property may be involved, a holding
device must be an integral part of the driven equipment beyond the
speed reducer output shaft. An additional warning label has been
provided for the end user to place on speed reducer for convenience of
easy visibility.
WARNING: All products over 25 kg (55 lbs) are noted on the shipping
package. Proper lifting practices are required for these products.
4. Match the arrow on the backstop inner race to the direction
of free rotation for the desired direction of shaft rotation. Note
that reversing the backstop end-for end changes the direction
of the arrow. The shaft will rotate in the same direction as the
arrow on the backstop.
5. If the backstop kit has a spacer ring included, install it onto the
shaft first, adjacent to the bearing inner ring.
6. Install the backstop inner race and sprag cage assembly
onto the shaft. DO NOT remove the cage from the inner
race or the shipping strap from the sprag set at this time.
Insert the key into the inner race and mating shaft keyway.
These parts should slip onto the shaft easily, a light coating
of oil may assist in assembly. Do not use a hammer to force
the installation, damage can occur to the shaft and/or the
backstop. Slide the race against the spacer or the shaft
shoulder and install the retaining ring into the groove in the
shaft. Only use the supplied key, as it is specifically designed
for each backstop.
7. Apply a thin coating of RTV silicone onto the gearbox mating
surface for the outer race (same as the cover area). It is
important to apply the sealant around the fastener holes to
prevent leakage. Do not allow excessive amounts of silicone
to enter the gearbox or to be applied to other parts.
8. Install the outer race by gently rotating it opposite the shaft
rotation while pressing lightly inwards. Do not force the outer
race into position as backstop damage may occur. Once
the outer race is well piloted onto the sprag set, remove the
shipping strap from the sprag set by cutting it, being careful
not to let the outer race back off the sprags. The outer race
should slide easily into position with a slight turning motion.
A light coating of oil on the race inner diameter may ease
installation.
9. Align the fastener holes in the outer race with the mating
holes in the gearbox. Use the supplied grade 5 fasteners
and lock washers only. Torque the fasteners in an alternating
pattern per Table 1.
INSTALLATION
1. Remove backstop shaft cover and gasket (Figure 1). These
parts will not be reused. This cover is directly opposite the
extended end of the input shaft.
2. Clean the face of the gearbox to remove any gasket material
or contamination from the cover mounting surface. It is
important that contamination not get into the gearbox or the
backstop during the backstop installation/servicing process.
3. Face reducer looking at the side from which the cover
was removed. Determine carefully the desired direction of
free rotation. It is important that the direction be correctly
determined because to reverse the direction after the
backstop is installed, it is necessary to remove the backstop,
turn it end-for-end and then reinstall it.
