SECTION VI. RADIO INTERFERENCE SUPPRESSION

Figure 4-4. Organizational Preventive Maintenance Sequence of Checks and Services (Sheet 1 of 2)

Table 4-2. Organizational Troubleshooting

TM-10-4930-204-13 Tank and Pump Unit Liquid Dispensing for Truck Mounting (United Manufacturing and Engineering Corp. Model Style 1) Manual
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TM 10-4930-204-13 4-14 l ORGANIZATIONAL MAINTENANCE TROUBLESHOOTING. For organizational troubleshooting, refer to table 4-2. NOTE Before you use this table, be sure you have per- formed all normal operating checks. If you have a malfunction which is not listed in this table, notify the next higher level of maintenance. SECTION VI. RADIO INTERFERENCE SUPPRESSION 4-15. GENERAL METHODS USED TO ATTAIN PROPER SUPPRESSION. Essentially, suppression is attained by providing a low resis- tance path to the ground for stray currents. The methods used include shielding the ignition and high-frequency wires, grounding the frame with bonding straps and using capacitors and resistors. 4-16. INTERFERENCE SUPPRESSION COMPONENTS. a. Primary Suppression Components. The primary suppression com- ponents are those whose primary function is to suppress radio inter- ference. The primary component is described and located in figure 4-5. b. Secondary Suppression Components. These components have radio interference suppression functions which are incidental or secondary to their primary function. 4-17. REPLACEMENT OF SUPPRESSION COMPONENTS. a. Removal. Tag and disconnect electrical leads and remove four screws securing the radio interference suppression filter to motor junction box and remove the interference filter (fig. 4-5). the the b. Installation. Install replacement radio interference sup- pression filter and secure to motor junction box with four screws. Remove tags and reconnect electrical leads (fig. 4-5). 4-18. TESTING RADIO INTERFERENCE SUPPRESSION COMPONENTS. Test the interference filter by using a method of substitution. If a faulty filter is detected, replace it with one known to be good. SECTION VII. MAINTENANCE 4-19. GENERAL. This section provides maintenance assembly and hoses that are applicable Components of the pumping assembly and OF PUMPING ASSEMBLY instructions for the pumping to organizational maintenance. hoses consist of all hoses, the 4-12

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