USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
(4) Apply penetrating oil to rusted nuts and/or bolts that resist
turning. Allow time for the oil to penetrate before attempting to turn.
(5) Do not strike wrenches with hammers to tighten or loosen nuts or
(6) Do not exert a hard pull on a pipe wrench until it has a firm
grip on the work.
(7) Remember to pull on the wrench when possible, in order to protect
your knuckles in case the wrench slips.
(8) Always keep the wrench in good condition; clean, and free from
oil or grease.
f. Maintenance of Wrenches.
(1) Grinding and Filing Damaged Jaws. Fixed open-end and adjustable
open-end wrenches with damaged jaws can be made serviceable by grinding
and/or filing. When attempting this repair, finish- grind or file the jaw
opening of the fixed open-end wrench to the next largest standard size. Jaw
faces must be flat and parallel.
Use a part of the known size or a gage
block to test for correct size and parallelism.
Dip the jaws in water
frequently when grinding to preserve temper which can be lost because of
(2) Renewing Jaw Serrations.
To renew the serrations in auto,
monkey, pipe, and vise grip wrenches, use a fine triangular or flat tapered
file, and carefully deepen the low points between the serrations.
remove more material than is absolutely necessary.
(3) Adjustment for Play.
The movable jaw on adjustable open-end
wrenches may not remain parallel to the stationary jaw after prolonged use.
In most cases, the trouble is due to wear and to the worm spring having
To increase spring resiliency, remove the axle screw from the
wrench and separate the adjustable jaw, worm, and worm spring from the
handle (figure 32 on the following page).
Stretch the worm spring if the
spring is not cracked and is in good condition. Stretching the spring will
increase its tension and