7400 AGAVENCO "CROP LINE" VALVE
FIELD SERVICE INSTRUCTIONS
A.
Equipment for Valve Overhaul
1.
The AGAVENCO Kit K-7400 contains all necessary parts to overhaul valve.
2.
No special tools are required for overhaul. The only tools required are a screwdriver 7/16" wrench and a
3/8" wrench.
B.
Valve Disassembly
1.
Remove control lever from rotor shaft.
2.
Remove 8 screws holding end caps to valve body, and remove end caps.
3.
Remove rotor end flapper from valve body.
4.
Remove "back suction" flow control screw from body.
C.
Valve Overhaul Procedures
1.
Thoroughly clean all parts prior to beginning overhaul.
2.
Replace seals (7409) and washers (-7416) on flapper and install new screw and nut supplied in kit.
Tighten firmly so seals do not rotate.
3.
Install flapper assembly in body by inserting pin (7417), be sure nut on flapper assembly is opposite to
valve outlet port, to give smoother flow during operations.
4.
Install rotor (7404) to flapper being sure pins are engaged in slotted sides of flapper.
5.
Install bearing (7311), and gasket (7307) to end cap (7402) attach to valve body. At this point do not
securely tighten the four screws.
6.
Install thrust washer (7310) on rotor shaft.
7.
Install bearing (7311) two quad rings (7210) and gasket (7307) to end cap (7403). It is suggested you
now grease quad rings prior to sliding over rotor shaft. Attach end cop to body leaving the screws loose.
8.
Install lever on rotor shaft and tighten bolt to clamp lever to shaft.
9.
Tighten two opposite screws on each end cap and rotate lever to test valve operation and "over center
locking". Adjustment of end caps will give desired valve action and "over center locking", at this point
tighten securely the 4 screws on each end cap.
10.
Install new "O" ring on flow control screw grease well and install in valve body. The amount of "back
suction" is controlled by flow control screw position. Back suction can be shut-off with the screw
completely closed back off 2 to 2-1/2 turns for maximum back suction.
NOTE:
In emergency cases substitute material con be used in place of the seal (7409) to facilitate keeping your
airplane flying. Also, as you have now noted the flapper assembly can be shimmed behind the seal to give any
desired "over center" lock condition.
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