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CONTENTS - TM-5-4210-230-14P-1_184
TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
Checking and Correcting Front Wheel Toe-ln
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 Introduction Outlined herein are Front Alignment Specifications pertaining to "Caster" "Camber" "Toe-In" and "King Pin Inclination". Check alignment at regular intervals and particularly after front suspension has been subjected to extremely heavy service or severe impact loads.  Before checking and adjusting alignment, components such as wheel bearings, tie rods, steering gear, shock absorbers and tire inflation should be inspected and corrected where necessary . The caster, camber and toe-in settings are for unladen (no payload) vehicles. King pin inclination is not required for any of the front end alignment checking machines as a means of obtaining caster or camber.  A check of king pin inclination can be used as an indicator of damaged king pins, knuckles or spindles. Caster Measurement and Correction Caster specifications are based on unladen (no payload) vehicles.  If the frame is not level when alignment checks are made, this must be considered in determining whether the caster setting is correct. With the vehicle on a smooth, level surface, frame angle should be measured with a bubble protractor placed on the frame rail. The degree of tilt from the level frame position is the angle that must be used in determining a correct caster setting.  Positive frame angle is defined as forward tilt (front end down) and negative angle as tilt to rear (front end high). The measured frame angle should be added or subtracted, as required from the specified caster setting, to obtain the caster that should actually be measured on vehicle . 1. Positive frame angle should be subtracted from specified setting. 2. Negative frame angle should be added to specified setting. As an example, if the specified caster setting is a positive 1 deg.  and it is found that the vehicle has a positive one degree frame angle, then the measured caster should be 0 deg.     1/2 deg.  caster angle when the chassis is operating under load . Possible causes of incorrect caster are sagging springs, bent or twisted axle, or unequally tightened spring U-bolts.  In most cases a twisted axle would be the cause if caster varies more than the specified 1/2 deg.  between left and right side. If  caster  must  be  corrected,  taper  shims  can  be  used  as  required  between  the  springs  and  axle.    Spring  U-bolts  should  be tightened evenly and to specified torque after the addition or removal of shims.  Be sure spring center bolt drops into I-beam pilot. Also, when tightening U-bolt nuts, be sure at least one full thread of U-bolt is visible when nut is tightened to specified torque.  If not visible, use longer U-bolt. IMPORTANT When U-Bolts are replaced, the new must be grade 5 minimum incorporating rolled threads. U-bolt nuts are to be flanged head type or those having a nylon insert locking feature. CTS-2696S  Page 2 PRINTED IN UNITED STATES OF AMERICA

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