Section 7: Valve Maintenance
MAX Valve Repair and Replacement
2016 Bambi MAX Service Manual
–
Models 4453-7590
(Version D)
35
We Engineer Solutions
Drive Cable Replacement
Tools required:
Cable cutter or sharp side cutter, Allen key 7/64", wrench 5/16", heat shrink tubing 1/8", heat
gun.
If the helicopter is not available as a power and activator source, a 24-28 DC power source can be used.
Connect the negative line to the narrow blade on the plug and the positive to the round pin. The valve will
be in the closed position. To open the valve, touch the positive wire to the wide blade on the plug. If the
valve doesn't operate, check that the wiring in the plug hasn't been changed. Open the plug and check the
green wire which should go to the green screw, black wire to brass screw and white wire to silver screw.
Removing the existing cable.
The drive cable can be replaced with the valve in the bucket but, if you are doing other maintenance work
on the valve, it will be easier to change the cable outside the bucket.
1.
Cut the cable below the lift bar.
2.
Remove the cable retainer from the
lift bar.
3.
Remove the cable by pulling the
unswaged end through the sheave and
lift bar.
4.
To remove the cable ends from the cable
anchors, the motor will have to be started and
stopped when a cable anchor is close to the top.
Now, loosen the two cable anchor screws and
pull the cable through. Then, activate the motor
again to get the second cable anchor to the top,
loosen the two cable anchor screws and pull the
cable out.
Important Note
Use cyanoacrylate glue (crazy glue) on the ends of the cable, if available, to prevent fraying.