TM 5-2090-200-12&P 4-14. Roller Assembly a. Removal. (1)   Remove the spiral retaining ring (1, fig.  2- 5) from the axle (2). (2)   Push the axle (2) through the housing. (3)   Remove the roller (3). b. Cleaning and inspection. (1)   Inspect the roller assembly for worn or missing parts.  Inspect for excessive damage. WARNING Dry cleaning solvent, P-D-o80, used  to clean  parts is potentially dangerous to personnel and property.  Avoid  repeated and prolonged skin contact.  Do not use near open flame or excessive heat.  Flash point of solvent is 100°  F. - 138°  F.  (38°  C. - 59°  C.). (2)   Clean the roller with a dry cleaning solvent (Fed.  Spec.  P-D-680) and dry thoroughly. (3) Replace any worn or missing  parts. Replace al excessively damaged roller assembly. c. Installation. (1)   Place the roller {3) in position to the housing. (2)   Install the aide (2) into the housing. (3)  Install the spiral retaining ring (1) on the axle (2). 4-15. Sheave a. Removal. (1)   Remove the spiral retaining ring (5, fig.  2-5) from the axle (6). {2)   Push the axle (6) through the housing. (3)   Remove the sheave (7) and bearing (8). b. Cleaning and Inspection. WARNING Dry   cleaning   solvent,   P-D-680   or   P-S-661,   used   to   clean   parts   is   potentially   dangerous   to personnel  and  property.    Avoid  repeated  and  prolonged  skin  contact.    Do  not  use  near  open flame or excessive heat.  Flash point of solvent is 100°  F. - 138°  F. (38°  C. -- 59°  C.). (1)   Clean the sheave with cleaning solvent (Fed. Spec. P-D-680). (2)   Inspect the sheave for wear and damage. (3)   Replace any worn or damaged parts. c. Installation. (1)   Place  the  sheave  (7)  with  bearing  (8),  in  position  and  install  axle  (6)  into  the  housing.  {2) Install the spiral retaining ring.  (5) on the axle (6). 4-16. Rubber Pads a. Removal. (1)   Remove screw (1, fig.  4-2.1) and washer (2) from pad (3) and nut (4), screw (5), and washer (6) from pad (7). (2)   Strip the pad from the mounting surface. b. Cleaning, i7nspection and repair. (1)   Inspect  for  excessively    worn  or  loose  rubber  pads.    Check  for  gouges  and  rips  in  pads. When pad is removed, clean the mounting surface of old adhesive. (2)   Replace a pad that is worn to less than 0.25 inch thick, have gouges of sufficient number and depth to hamper boat from sliding over pads, or have rips exceeding 3 inches. c. Installation. (1)   Refer to figure 4-2.2 and cut a new pad. (2)   Drill and countersink holes in the new pad as shown in figure 4-2.2. (3)   Clean the mounting surface and bonding surface of the rubber pad with trichloroethylene. (4)   Bond the rubber pad to the mounting surface with oil-resistant polychloroprene rubber base adhesive conforming to MMM-A-1617, Type II.  Apply the adhesive in accordance with the manufacturer's instructions. (5)   Secure the pads (3 and 7) by installing screws (1 and 5), washers (2 and 6) and nut (4). SECTION VII.  MAINTENANCE OF THE DOLLY ASSEMBLY 4-17. General The dolly assembly rides on the cradle frame and 3upports the Bridge Erection boat.  It permits the boat to slide back and forward to aid in launching and retrieving.  The dolly supports the boat with the help of two attached stanchions and rides the frame on four wheels that are locked into the cradle frame. 4-18. Dolly Assembly a. Removal. (1)   Remove  the  capscrews  (25,  fig.    4-1),  lock-washers  (26),  flat  washers  (27),  and  access covers (24). (2)   Unlatch  the  dolly  (8,  fig.    1-1)  and  move  it  so  that  the  two  Wheels  line  up  with  the  access cutouts. (3)   Pivot the dolly upward so that two wheels are listed through the access cutouts and clear of the side beams. (4)   Move the dolly so that the remaining two wheels line up with the access cutouts. (5)   Lift the dolly so that the remaining two 4-6.  Change 2