Dixon 5500 Series Wartung und Betriebsanleitung - Seite 9

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• When the poppet (5.1) of the API rack coupler is in the open position, try to trigger the

release (16) to make sure that the sleeve (4) is locked by the interlocking cam surface of

the handle (10).

• Rotate the handle (10) to fully closed position. Trigger the release (16). The sleeve (4)

should move back and five interlocking cams (13) should unlock the nose ring of the API

adapter. The API rack coupler should be able to be removed from the API adapter.

• If there are problems with any of the above, see the following section to dismantle the API

rack coupler from the API adapter and remove the API rack coupler from the loading arm.

See Section "DISASSEMBLY" for further instructions of how to disassemble the API rack

coupler to inspect individual parts. Contact the factory if it is a new API rack coupler.

DISMANTLE API RACK COUPLER FROM LOADING ARM:

Warning: Read and understand this instruction manual before starting installation. Make sure that

there is adequate personal protection all the time when dismantling the API rack coupler from the

loading arm.

1. Shut off all working devices. Drain the loading arm. Dismantle the API rack coupler when it

is clean and dry.

2. Secure the loading arm from movement and support the API rack coupler. Make sure that

the API rack coupler is fully closed.

3. Loosen the bolts on the TTMA flange of the API rack coupler. Leave the two top bolts on

and remove the remaining six bolts first. And then remove the two top bolts.

4. Remove the API rack coupler from the loading arm. Remove the TTMA gasket between the

flanges.

REPLACE VALVE ASSEMBLY AND PARTS:

Note: Valve assembly (5) and parts can only be replaced when the API rack coupler is off the rack.

The design of the Dixon API rack coupler shaft (2) makes it easy to remove the valve assembly

from the API rack coupler as a whole. This makes it easy to replace the whole valve assembly (5)

or any individual part of the valve assembly (5). There is NO need to remove the bent link pins (5.3)

from the bent links (5.2) while the valve assembly is still in the API rack coupler.

Warning: Carefully handle the poppet (5.1) without damaging the sealing surface when replacing

valve assembly or parts. Even the smallest scratches on the sealing surface can cause leakage.

1. When the API rack coupler is off the rack, DO NOT remove the handle shoulder screw (21)

and lock nut (22) from the handle (10) yet same as the shoulder screw (27) and lock nut of

sleeve lock (26). When API rack coupler is closed, remove the shaft cotter pin (3) from the

shaft (2) by using pliers.

2. Defeat the interlock manually or use an API adapter nose ring so the sleeve (4) can move

fully forward to the outlet of the API rack coupler.

3. Turn the handle (10) to open the API rack coupler.

4. Pull out the shaft and handle assembly with locking plate (9), dust O-ring (28), bearing

assembly (7), bearing washer (8), while inside shaft washer (29), valve assembly (5) and

spacer (11) will fall free of the shaft (2).

5. Inspect all parts of the valve assembly (5) and replace any damaged parts. When

reassembling the valve assembly, make sure the bent links (5.2) and the drive link (5.6) are

assembled in the same orientation as shown in the valve assembly figure.

6. Assemble the shaft and handle assembly with sleeve lock (26), locking plate (9), dust O-ring

(28), bearing assembly (7) and bearing washer (8) to the body (1). Assemble the inside

shaft washer (29), drive link (5.6) and the spacer (11) before pushing the other end of the

090140 REV5 2021/12/15

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