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Fig. 33  Burnishing Upper and Lower Bushings Using Burnisher Tool
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig. 39  Removing Tachometer Drive Gear Pin
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 MECHANICAL ADVANCE SYSTEM SERVICE Mechanical advance system components are not provided for service  individually.    However,  it  is  recommended  that  the mechanical  advance  system  be  disassembled  for  inspection and  lubrication,  as  outlined  below,  at  the  time  of  distributor overhaul. Disassembly (Refer to Figure 37). IMPORTANT Mark   Advance   weights,   weight   pivot   pins   and trigger  wheel  assembly  to  assure  reassembly  in the same positions. 1. Remove felt wick. 2. Remove     trigger     wheel     assembly     retainer     from distributor shaft using hooked extractor tool. NOTE:   Do   not   remove   trigger   wheel   from   the trigger wheel assembly, Figure 37. 3. Slide trigger wheel assembly from distributor shaft. 4. Remove    primary    and    secondary    advance    weight springs. 5. Remove advance weights and thrust washer. Fig.  37 Mechanical Advance System Components 1.  Trigger wheel assembly 4.  Thrust washer 2.  Felt wick 5.  Weights 3.  Retainer 6.  Springs Inspect mechanical advance components.  If wear or damage is found, replace distributor shaft assembly. Reassembly 1. Lubricate  advance  weight  bushings  and  pivot  pins with  a  light  film  of  premium  quality  grease  (Mobile No. 532 or equivalent).  Install weights on pivot pins. 2. Install advance springs. 3. Make sure advance weights pivot freely on pins. 4. Lubricate   trigger   wheel   assembly   pilot   surface   of distributor shaft with premium quality grease. Grooves    in    pilot    diameter    should    be    filled    with lubricant.  Lands between grooves should have only a thin film of lubricant. 5. Apply a light coat of premium quality grease to thrust washer   and   position   thrust   washer   on   distributor shaft. 6. Position  trigger  wheel  assembly  on  pilot  surface  of distributor shaft. Align slots in trigger wheel yoke with pins   on   advance   weights   and   push   trigger   wheel assembly into position. 7. Install trigger wheel assembly retainer.  If necessary bend  arms  of  retainer  to  assure  that  retainer  grips slow in distributor shaft. 8. Install felt wick. 9. Make sure mechanical advance mechanism operates freely. TACHOMETER DRIVE SERVICE Tachometer Drive Gear and Bearing Replacement Tachometer  drive  gear  and  bearing  (Figure  38)  can be replaced by following the procedure outlined below. Fig. 38  Tachometer Drive Gear and Bearing 1.  Bearing 2.  Tachometer drive gear CGES-145-U  Page 17 PRINTED IN UNITED STATES OF AMERICA

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