TM 9-2910-226-34 Figure 3-97. Timing device assembly, exploded view. (2) Inspect the timing device housing (H) for cracks, nicks, burs, and damage to mating surfaces. Replace the housing when cracked. Minor nicks or burs may be cleaned up with crocus cloth. (3) Inspect the splines of the weight and spider assembly (G), sliding gear (L), and timing device hub (P) for damage, wear, and fit on mating sur- faces. Remove minor burs and scratches from splines with crocus cloth. Replace all parts having splines which are damaged or do not fit properly with mating surfaces. (4) Refer to figure 3-98. Inspect the pins that secure the weights to the spider. Weight and spiders assembled with pin (A) should be discarded and replaced. Weight and spiders assembled with pin (B) can be reused if the pins have no end play and are tight. Figure 3-98. Comparison of timing device weight pins. (5) Examine the weight on the spider assembly (G) for freedom of movement. Replace the weight and spider assembly when the weights do not move freely. C . Assembly. Assemble the timing device assembly as follows: (1) The parts for the universal timing device repair kit are listed in Appendix B. When any part in the repair kit— 5702661 except hardware items, must be replaced, replace all parts applicable to the timing device assembly. (2) Refer to figure 3-97. Do not install timing cover at this time. The timing device assembly parts will be installed during assembly of pump. 3-28. Repair of Hydraulic Head Assembly. NOTE Except for the upper and lower head preformed packings, component parts of the hydraulic heads are not spare parts. If any part shows evidence of wear or other damage replace the complete head assembly. Refer to figure 3-99. Hydraulic head assemblies identified by American Bosch part number HD9070A (FSN 2910-084-0259), used on some code F pumps, are prone to cracking between the delivery valve screw and cylinder No. 3 port. These heads must be replaced upon disassembly of injection pump. 3-61