TM   5-3895-363-13&P 14.2 TRIPPING  DEVICE  WON’T  START  THE  HAMMER 14.2.1 SYMPTOM OF TROUBLE Piston  can’t be  raised. PROBABLE CAUSE TEST The  failure  to Tripping  device  linkage pick  the is  damaged. piston  is  the  test. 14.2.2 Piston  re- leases too early. Tripping  device  leaf The  early  release  of spring,  or  trip  cam  with the  piston  is  the  test. lever  is  damaged 14.3 14.3.1 14.4 TRIPPING  DEVICE  WON’T  RAISE  HAMMER SYMPTOM OF TROUBLE Lifting  cam doesn’t  en- gage upper cylinder. PROBABLE CAUSE TEST REMEDY Lifting  cam  torsion The  inability  to  raise  the spring  has  failed  or  lack hammer  is  the  test. Remove  tripping  device of  lubrication  on  lifting from hammer per Sec- tion  10.4.1.1.  Disassem- cam’s shaft. ble  per  Sections 10.4.10.7   through 10.4.10.9 repair, reas- semble  and  install. ERRATIC   PISTON   STROKE REMEDY Remove  tripping  device from  hammer  per  Sec- tion  10.4.1.1.  Disassem- ble  per  Section 10.4.10.1   through 10.4.10.6, repair, reas- semble  and  restart. NOTE:  Variable  soil  conditions  can  cause  a  variable  stroke  for  which  there  is  no  mechanical solution. SYMPTOM OF PROBABLE TROUBLE CAUSE TEST REMEDY Short,  slow, Lack  of  lubrication  or steady stroke damaged upper Section  7.2 as if piston is cylinder. Visually  observe  piston Fill  piston  with  oil  per OIL NO dragging. PRESENT YES PISTON NO Check   upper   cylinder ROTATING for  damage  see  Section 10.4.2.3. Erratic  stroke, Hammer  flooding. See  Section  14.1.1 See  Section  14.1.1 with  black exhaust smoke. Erratic  stroke, Contaminated   fuel. See  Section  14.1.2 with See  Section  14.1.2 intermittent gray  to  white exhaust smoke 23