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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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PUMP FAILS TO PRIME OR LOSES PRIME (cont)
TM 5-4210-233-14&P-1 Table 4-2.  Unit Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION FIREFIGHTING SYSTEM - Continued 1 PUMP FAILS TO PRIME OR LOSES PRIME - Continued Step 2. No oil in priming tank. NOTE With rotary primer, oil is usually required to maintain a tight rotor seal. Step 3. Check priming tank oil supply and replenish, if necessary. CAUTION Speeds     much     higher     than     those     recommended     do     not accelerate priming, and may actually damage priming pump. Step 4. Engine speed too low. Refer to operating instructions for correct priming speeds. Step 5. Check for air leaks. Clean and tighten all suction connections.  Make sure suction hoses and gaskets are in good condition. . Step 6. Check for dirt on suction strainer. Remove all leaves, dirt, and other foreign material from suction strainer. When drafting from shallow water source with mud, sand, or gravel bottom, protect suction strainer in one of the following ways: a. Suspend suction strainer from a log or other floating object to keep it off bottom.  Anchor float to prevent it from drifting into shallow water. b. Remove top from a barrel.  Sink barrel so open end is below water surface.  Place suction strainer inside barrel. c. Make a suction box, using fine-mesh screen.  Suspend suction strainer inside box. Step 7. Check for defective priming valve. Refer to Direct support maintenance level. 4-51

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