Operating Manual
TM-290-OM
Page 1 of 4
REV: C – 04/11
Model TM-290 Torque Multiplier
1. INTRODUCTION
This handbook covers operation and service instructions for the
model TM-290 torque multiplier.
2. IMPORTANT INSTRUCTIONS
2.1 Read and understand these operating instructions before using
the torque multiplier.
2.2 DO NOT USE AN IMPACT WRENCH ON THE TORQUE
MULTIPLIER. DAMAGE TO TOOL COULD OCCUR.
2.3 DO NOT EXCEED RATED INPUT CAPACITY (250 Lbf-Ft or
333 N·m)
2.4 hen positioning the torque multiplier, be sure socket attached to
the output is positioned so that the reaction tube is at a right
angle to the fastener. Torque reaction creates a rotational force
in the opposite direction from which input force is applied. See
Application Tips for additional torque multiplier reaction
information.
2.5 Keep couple between the torque multiplier output and the
fastener that torque is being applied to as short as possible,
and the couple between torque multiplier and anchor tube as
long as possible. This will maximize torque multiplier life.
2.6 Remember: Breakout torque can be much greater than the
make up torque value. Be sure that the multiplier being used
has sufficient capacity for torque breakout. Allow a minimum of
50% additional capacity in the tool for breakaway torque.
Damaged and corroded fasteners can require even greater
breakaway torque capacity.
2.7 When using the torque multiplier without a torque wrench to
monitor input torque, remember that the output torque is
significantly greater than the applied input torque. Do not apply
more torque than the application can withstand.
2.8 Use only Williams approved replacement parts.
3. DESCRIPTION AND DESIGN FEATURES
3.1 The model TM-290 torque multiplier uses a planetary geared
action to tighten and loosen nuts, bolts and cap screws with a
continuous 360° rotation in either clockwise or
counterclockwise direction. Input and output rotation directions
are the same (EXAMPLE: Clockwise input rotation creates
clockwise output rotation).
3.2 The reaction anchor tube is held in place by a detent pin, which
is easily removed by pushing on the end of the pin.
4. SPECIFICATIONS
Gear Stages One
Accuracy ±5% of reading from 20% to
100% of full-scale rating
Output Capacity 750 Lbf-Ft (1020 N·m)
Input Capacity 250 Lbf-Ft (333 N·m)
Gear Ratio 1: 4
Torque Ratio 1:3.0
Output Drive Male Square 3/4" (19mm)
Input Drive Female Square 1/2" (13mm)
Overall Dimensions
A 8.53" (217)
B 2.81" (71mm)
C 3.25" (83mm)
Net Weight 4 lbs (1.82 kg)
Figure 1. Torque Multiplier Parts and Dimensions
5. TORQUE CONVERSIONS
5.1 A data plate is attached to the torque multiplier which displays
the input torque required to obtain the listed output torque
values. If you wish to calculate a specific input value that isn’t
listed on the attached chart, divide the desired output torque by
the multiplier’s torque ratio (3.0) to determine the input torque
required (e.g. 750 Lbf-ft output torque ÷ 3.0 torque ratio = 250
Lbf-ft input torque).
WARNINGS
•Always maintain firm hand control of torque wrench or
input handle while using the multiplier, since recoil (wind-
up) will be experienced.
•Inspect output square drive for visible sign of fatigue or
fracture prior to EACH use. Replace if necessary.
•Failure of the output square drive, due to torque overload or
fatigue, could result in an immediate torque release,
potentially causing the torque multiplier to fall from the
fastener, and result in personal injury.
•Do not hold torque multiplier or reaction anchor tube while
applying torque since normal multiplier deflection might
cause fingers to be pinched; especially in confined
locations.
•Do not use output drive extensions. Increased deflections,
caused by the added length could force the socket off the
nut, or break the extension or socket.
•Since reaction torque equals OUTPUT torque, be sure to
select an anchor point sufficient to withstand the torque
reaction forces created.
