FRAME 10-2. TM  10-3930-643-34 AND  TOWING  ATTACHMENTS  MAINTENANCE. Frame Hinge Pin and Frame Assembly. (Sheet 12 of 13) INSTALLATION 63. 64. 65. 66. 67. Lubricate bores with clean grease. Using a hammer and drift punch, install two bushings (24) on left and rights sides of rear frame. Lubricate  bore  with  clean  grease. Install bushing (21), refer to step 44. Use  ports-power  or  equivalent to push bushing (21) into front frame tongue  until  bushing  seats  against counterbore  of  tongue. Lubricate  bore  with  clean  grease. Install  bushing  (23)  until  flush with frame ear surfaces. Lubricate  bore  with  clean  grease. Install  bushing  (22)  until  flush with frame ear surfaces. Using a 1/2”   socket,  socket  wrench handle and a 1/2” open end wrench, position two new seals (20). One seal goes on top of upper front frame  tongue  and  one  goes  below tongue. Cutting of new seals is not necessary if shafts (15 or 11) have been removed. If shafts are already  in  place,  then  cut  new seals and use bolts (19) and nuts (18) to secure seals (20). Go to Sheet 13 10-17