Frame - Hansen Web Design
Contents
1. Donated by John amp Susan Hansen For Personal Use Only FRAMES L LINE MOTOR TRUCK SERVICE MANUAL pmte N age FRAME GROUP SECTION A Page Prame alinei s sarrera ERO inakap k eaa a aaa l Checking 2ramie Alignment 4 hs 66h KRM EEE EHS ERE ESTERS SEARED EES Axle alignment with frame 6 662s ve2eenaveees ee eee ee ee ee ee ea l Frame straightening sess see eee ee re eer errr renner ner erer rr serrrrseers Z PRINTED IN UNITED STATES OF AMERICA Donated by John amp Susan Hansen For Personal Use Only Donated by John amp Susan Hansen For Personal Use Only L LINE MOTOR TRUCK SERVICE MANUAL FRAMES Section A Page 1 FRAMES Frame Alignment Any vehicle that has been in an accident which might result in a bent or sprung frame should have the frame and axle alignment care fully checked Checking Frame Alignment A satisfactory method of checking the frame and axle alignment particularly when a body and cab is ona chassis is to mark on a level floor all points at which measurements are to be taken Tack or cement pieces of paper to the floor directly under each point of measure ment on the chassis as indicated by the letter K in the various figures The points of meas urement must beaccurately marked in relation to the frame in order to obtain a satisfactory alignment check After each measurement point has been carefully marked on the floor proceed as fol lows l Locate center lin2. d In addition to thoroughly welding the cut in the side rail the outside edges of the reinforce ments should be welded to the frame after the reinforcements are riveted All unused holes should be filled with welding material Welding rod should be substantially the same material as that used in the frame The diameter of the reinforcement rivets depends upon spacing and the number of rivets used Generally rivets should be from 50 to 100 as heavy in diameter as the total thick ness of the plates to be riveted Frame Straightening Use of heat is not recommended when straightening frames Heat weakens structural characteristics of frame members and all straightening should be done cold Frame mem bers which are bent or buckled sufficiently to show cracks or weakness after straightening should be replaced or reinforced Inverted L type frame reinforcement Fig 3
3. e of chassis by measuring front and rear end widths using marks on floor If frame widths check draw center line on floor full length of chassis If frame widths do not check lay out center line as follows 2 Centerline can be drawn through the inter section of any one pair of equal diagonals A A B B C C D D and center point of one end of frame or through points of inter section of any two pairs of equal diagonals Pa K a a ae X e K Sa E Sau 5na iK L 110 FRAME ILLUSTRATED 3 Measure distance from center line to oppo site points marked over entire length of frame Measurements should not vary more than 1 8 at any point 4 Measuring diagonals A A B B C C D D will indicate point where misalignment oc curs If diagonals in each pair check with 1 8 that part of frame included between points of measurement may be considered in satisfactory alignment These diagonals should intersect within 1 8 of center line Axle Alignment with Frame After determining that frame is properly aligned the axle alignment with the frame should be checked by comparing diagonals Dimensions for side elevation of frame should be checked at the points indicated and should not vary more than 1 8 Cutting Reinforcing Riveting and Welding Whenever it is necessary to cut the frame the side rail should be cut at an angle of 45 degrees This method distributes the cut a
4. nd weld over a greater area than a cut made at right angles with the rail Reinforcements can be made with flat channel or angle stock Because of difficulties encountered when inserting channel reinforce ments into frame side rails the use of angle reinforcements is acceptable Wherever pos sible the reinforcement should extend from the A 22709 Figs i Frame and Axle Alignment Checking Diagram PRINTED IN UNITED STATES OF AMERICA Donated by John amp Susan Hansen For Personal Use Only FRAMES Section A Page 2 Center of chassis L LINE MOTOR TRUCK SERVICE MANUAL at on Pea L 150 FRAME ILLUSTRATED A 22710 Fig 2 Frame and Axle Alignment Checking Diagram front axle to slightly beyond the rear spring front mounting bracket as shown in illustration below This procedure of course may be impractical in some instances because of the position of attached units and existing cross members The reinforcement thickness should not exceed that of the side rail tobe reinforced Wherever possible parts should be secure ly riveted together Hot rivets are acceptable as they can be more easily driven with hand tools Cold rivets should only be used where tools of sufficient power to properly set the rivets are provided Electric arc welding is recommended for allframe welding The heat of the weld is lo calized and burning of material is minimized when this method is use
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