TM10-3930-660-34 16-18.  BOOM HOIST CYLINDERS - REPAIR This task covers: a. Disassembly b. Cleaning c. Inspection d. Assembly Initial Setup Tools Materials/Parts Shop Equipment, Automotive Container Maintenance, Common 12 Dry Cleaning Solvent P-D-680 (App. B, Less Power Item 48) Hydraulic Oil (App. B, Item 35) Wrench Set, Spanner, Consisting of Loctite #271(App. B, Item 43) the following: Nut (14) Spanner Wrench, Frame Tilt Cylinder; O-rings (5, 6, 7, 11, 16 18) Spanner Wrench, Carriage Tilt and Seal (13) Attachment Hoist; Spanner Wrench, Fork Sideshift Cylinder - Outer Gland; Spanner Wrench, Fork Sideshift Cylinder - Outer Piston; Spanner Wrench, Boom Lift Cylinder and Boom Extend Cylinder Equipment Condition Boom hoist cylinder removed, TM10-3930-660-20. DISASSEMBLY 1. USE A VISE WITH SOFT JAWS TO SECURE CYLINDER IN A HORIZONTAL POSITION FOR DISASSEMBLY. WARNING Hydraulic oil, under pressure, can remain within cylinder after disconnecting hydraulic hoses.  To avoid severe personal injury, slowly loosen counterbalance valve (1) and allow pressure to escape before removing valve entirely. 16-112