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1-20 1-21-2019 Control # 104-07

INTRODUCTION SERVICE MANUAL 1400A

Torque Wrenches

Torque wrenches are precision instruments and are to be

handled with care to ensure calibrated accuracy. Calibration

checks should be made on a scheduled basis. Whenever the

wrench might be either overstressed or damaged, it should

immediately be removed from service until re-calibrated. An

erratic or jerking motion of the wrench can easily result in

excessive torque. ALWAYS use a slow wrench movement

and STOP when the predetermined value has been reached.

NOTE: Torque values are in foot pounds (Nm). Torque

values apply to plain finish and zinc plated

fasteners. Torque values specified are dry with as

received residual oils. Special lubricants are not

recommended.

Torque values for bolts listed above are not

affected with the use of Loctite.

Loctite should not be used on rotation bearing

fasteners. Hardened washers should be used with

Class 8 fasteners

Using Torque Wrench Extensions

1. Torque wrench extensions are designed to extend the

range or versatility of torque wrenches. Torque wrench

scale readings or limit settings shall be computed with

the following formulas when an extension handle is

employed. The sketch below shows which formula is to

be used, adding “A” or subtracting “A” when calculating

the torque wrench setting.

2. If the offset C/L is not in line with the torque wrench C/L,

then you must measure the distance from the C/L of the

torque wrench to the C/L of the offset by using a square.

Then apply this dimension to the torque wrench setting

formula. See sketch below.

3. If offset is positioned at right angles to the torque

wrench, then the offset will not change the effective

length. Therefore, TW-wrench setting and Ta-applied

torque, will be the same value as if no offset were used.

Reference

Only

Manitowoc 1400A User Manual

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