Dual Over Center Valve

Figure 4-51. Dual Over Center Valve Cylinder and Valve Port 2 Section, Test.

TM-5-5420-209-12 Cargo Pallet Ribbon Bridge Transporter (NSN 5420-01-008-7436) Manual
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TM 5-5420-209-12 4-46. Dual Over Center Valve. This task covers: a. Test b. Adjust c. Replace INITIAL SETUP Tools Equipment Condition: General Mechanic’s Automotive Tool Kit Bay removed (para. 2-16). (Item 1, Appendix B) Hydraulic Test Equipment Materials/Parts Antiseize Tape (Item 19, Appendix E) NOTE There are two dual over center valves on transporter. The maintenance procedures are the same for both. a. Test. (figures 4-51 and 4-52) (1) (2) (3) (4) (5) (6) (7) (8) (9) NOTE Dual over center valve removed for test. See para. c. below. Connect a 0-6,000 psi (0-41,307 kpa) hydraulic pressure source and gage to a cylinder port 2. Connect a 0-300 psi (0-2,068 kpa) hydraulic pressure source and gage to cylinder port 1. Connect valve port 2 to hydraulic reservoir and 0-30 GPM flow meter. Plug valve port 1. Set pressure at cylinder port 2 to 0 psi (0 kpa). Increase cylinder port 1 pressure in 50 psi (345 kpa) and record the pressure at which flow occurs between cylinder port 2 to valve port 2. Increase cylinder port 1 pressure up to 250 psi (1,705 kpa) or until flow occurs between cylinder port 2 and valve port 2 at 0 psi (0 kpa). Adjust valve (see para. b. below) if valve does not perform within tolerances. Reduce all pressures to 0 psi (0 kpa) and disconnect connections. 4-168

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