TM 9-4940-568-34
3-40
3-12. SWING DRIVE ORBIT MOTOR REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP
Tools
Tool Kit, General Mechanic’s
(Item 67, Appendix F)
Materials/Parts
Compound, antiseize (Item 8, Appendix B)
Hydraulic oil (Item 16, Appendix B)
Sealant, adhesive (Item 28, Appendix B)
Sealing compound (Item 29, Appendix B)
Lockwasher (2) (Item 42, Appendix E)
Packing, preformed (Item 73, Appendix E)
Packing, preformed (Item 125, Appendix E)
Equipment Condition
FRS unloaded, (TM 9-4940-568-10).
Cross-relief valve removed (para 3-32).
Special Environmental Conditions
Cleanliness is extremely important when working
on hydraulic equipment. Clean all parts before
disassembly and work in a clean area.
General Safety Instructions
To avoid personal injury, always assume
hydraulic lines have pressure. Slowly crack
hydraulic lines open to allow all pressure to
escape. Always wear safety glasses.
a.
Removal
NOTE
Place a container to catch
hydraulic oil during removal of
hydraulic line.
(1) Remove hose (1) and preformed packing
(2) from elbow (3). Discard preformed
packing.
(2) Remove elbow (3) and preformed
packing (4) from swing drive orbit motor
(5). Discard preformed packing.
(3) Remove two allen head screws (6),
lockwashers (7), and swing drive orbit
motor (5) from swing drive assembly (8).
Discard lockwashers.
b.
Installation
NOTE
Lubricate all new preformed
packing with clean hydraulic oil.
(1) Apply sealing compound to threads of
two allen head screws (6).
(2) Apply adhesive sealant to mounting
flange of swing drive orbit motor (5) and
apply antiseize to motor splines of swing
drive orbit motor (5).
(3) Install swing drive orbit motor (5) on
swing drive assembly (8) with two new
lockwashers (7) and allen head screws
(6). Tighten allen head screws (6) to 35
lb-ft (47 N.m).
(4) Loosen four screws (9) in two stops (10)
on swing drive assembly (8).
(5) Move two stops (10) firmly around swing
drive orbit motor (5) and tighten four
screws (9) to 35 lb-ft (47 N.m).
