TM 5-5420-278-24&P0066 000066 00-1/2 blankDIRECT SUPPORT TROUBLESHOOTINGIMPROVED RIBBON BRIDGE (IRB)RAMP BAY M16NSN 5420-01-470-5825 P/N 12478918;INTERIOR BAY M17NSN 5420-01-470-5824 P/N 12478919.PUMP SYSTEM TROUBLESHOOTINGNOTERefer to the general instructions in Introduction toTroubleshooting, WP 0061 00, prior to performing pump system troubleshooting.1.PUMP SYSTEM WILL NOT RAISE BAY (RAMP BAY ONLY)Step 1. Check cylinder for internal leak.Repair cylinder if leaking.Step 2. Check pump for internal leak.Repair pump if leaking.Step 3. Check pump control valves for leaks.Replace pump control valves if leaking.Step 4. Check cylinder valve block for leaks.Replace cylinder valve if leaking.END OF TESTING2.PUMP SYSTEM WILL NOT HOLD BAY IN RAISED POSITION (RAMP BAY ONLY)Step 1. Check pump control valves for leaks.Replace pump control valves if leaking.Step 2. Check cylinder valve block for leaks.Replace cylinder block if leaking.Step 3. Check cylinder for internal leak.Repair cylinder if leaking.END OF TESTINGDirect Support Pump System TroubleshootingMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONEND OF WORK PACKAGE
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