TABLE 3-1. DIRECT AND GENERAL SUPPORT TROUBLESHOOTING (CONTD)
Test or Inspection
SLOW HOIST OPERATION UP
Step 1. Damaged hydraulic pump disconnect.
Check speed of other hydraulic functions under load. If all operations are slow, repair or adjust pump
Step 2. Defective three-section hydraulic pump.
Install flow meter in exhaust line of pump. Under moderate load, check for proper output (50 GPM at 2400
Damaged pumps normally build heat. By hand, carefully check temperature of pump in relation to other
Step 3. Damaged 0-rings in brake piston.
Install a 0 to 5000 psi (0 to 34,475 kPa/344.8 bar) pressure gauge in pipe plug in line going into center of
brake housing. Inability to build or hold pressure at 500 psi (3447.5 kPa/34.48 bar) in this line indicates
defective preformed packing. Replace if damaged. (Refer to page 15-64.)
Step 4. Warped brake piston.