Westco 16-25, Руководство по эксплуатации продукта, Страница: 22 / 49

Troubleshooting, Repair
Section 5
and Overhaul
Troubleshooting
Correct any problems encountered with the tong as recommended in Figure 5-1.
Repair
In general, repair consists of replacing worn or broken parts. When a part is determined to be faulty through either
inspection or an operational check, remove the part and replace it with a new one according to the instructions in
"Jaw Installation and Parts" and "Tong Disassembly and Parts." The component parts are illustrated and identified in
those sections of the manual. After any major repair, the tong should be serviced as described in "Maintenance."
Figure 5-1: Troubleshooting
Symptom
Tong fails to grip
Jaws come out of neutral cam
but will not penetrate pipe
Jaws do not come out of neutral
cam
Tong does not develop sufficient
torque
Probable Cause
Wrong size of jaws in tong or
wrong rollers in jaw
Drag magnet does not work
Dies fail to grip pipe
Undersized pipe
Tong not hanging perpendicular
to pipe
Magnets not strong enough
Oversized pipe
Power unit pressure not set high
enough
Power unit properly set, but relief
valve on tong not set high
enough
Relief valve stuck
Relief valve leaking
Faulty tong valve or motor
Faulty torque gauge
Corrective Action
Install correct jaw and roller
assemblies
Replace drag magnet
Clean or replace dies
Install oversize roller (1/16 inch
OD larger)
Adjust bail until tong hangs level
Replace
Install undersized rollers (1/16 inch
OD smaller)
Refer to instruction manual on
power unit
With pressure gauge in the relief
valve "gauge port," stall tong and
turn valve relief screw adjust-
ment clockwise until pressure is
set correctly
Check and clean valve
Check valve spring
Check hydraulic fluid for
Cleanliness
Check valve seats and oil for
contaminants
Repair or replace valve or motor
Repair or replace torque gauge
Section 5 Page 1