Dixon 5500 Series Maintenance & Operating Instructions - Page 7

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These instructions and recommendations are provided to ensure proper operation and long service

life of the Dixon 5500 API rack coupler. Parts are identified by the item numbers on the assembly

drawing and part list.

SUGGUESTED MAINTENANCE SCHEDULE:

1. MONTHLY INSPECTION

Visual inspection of the API rack coupler operation can be done while the API rack coupler is still

on the loading arm. All safety precautions that apply to the use of the API rack coupler must be

followed.

While the API rack coupler is still on the loading arm, visually examine the API rack coupler for any

worn or damaged parts, such as the body (1), sleeve (4), handle (10), bail (18), poppet (5.1), nose

seal (6.3), interlocking cams (13), latch (15), flange bolts, etc, or any other condition that may affect

the operation of the API rack coupler.

Examine the API rack coupler to make sure that the API rack coupler functions well. See Clause 3

in Section "INSTALL API RACK COUPLER TO LOADING ARM" for procedures.

Check the handle (10) for free and easy movement of the opening and closing cycle. Operation of

the handle (10) normally requires limited effort. If operating the handle (10) involves stronger force,

it implies the need to clean and possibly replace the shaft bearing (7) and the shaft (2).

During service time when the line is filled with liquid product, visually check for evidence of

leakage, especially through the shaft seals (7.2, 7.3, 7.4, 7.5 and 28), nose piece seals (6.2, 6.5),

nose seal (6.3) and the flange gasket. Any evidence of leakage means there is a need for further

maintenance.

2. YEARLY INSPECTION

For yearly inspection, the API rack coupler should be removed from the loading arm. See Section

"DISMANTLE API RACK COUPLER FROM LOADING ARM" for procedures of how to dismantle

the API rack coupler from the loading arm. See Section "DISASSEMBLY" for procedures of how to

disassemble the API rack coupler for further maintenance.

It is recommended that all seals (6.2, 6.3, 6.5, 7.2, 7.3, 7.4,7.5 and 28) should be inspected every

12 months. Replace any worn or damaged seals. See Section "REPLACE SEALS" for

procedures.

It is recommended that the valve assembly should be inspected every 12 months. Check the bent

links (5.2), and poppet (5.1) carefully to make sure that there is no permanent deformation, wear,

cracking, or any other damage. Check the bent link pins (5.3) carefully to make sure there is no

permanent deformation such as bending and cracking. Replace any deformed, worn or damaged

parts in the valve assembly. See Section "REPLACE VALVE ASSEMBLY AND PARTS" for

procedures.

Warning: Deformed bent link pins (5.3), drive link (5.6) and bent links (5.2) may cause leakage

through poppet seals. Further service will lead to cracks and breakage, which will cause a

complete failure of the API rack coupler.

Visually examine the shaft (2) every 12 months for significant dirt accumulation that could cause

shaft seal leakage. Visually examine the shaft (2), bearing washer (8), handle (10) and shoulder

screw (21) for wear and damage. Replace any worn or damaged parts.

090140 REV5 2021/12/15

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