Westco 16-25, Руководство по эксплуатации продукта, Страница: 23 / 49

Figure 5-1: Troubleshooting (Continued)
Symptom Probable Cause Corrective Action
Tong does not develop sufficient
torque (continued)
Motor runs but tong does not
rotate
Tong rotates slowly
Tong hangs up under light load
Tong rotates when control lever
is in neutral
Shifting lever will not remain in
high-speed position
Motor leaks
Oil leaks from gear box
Seal presents chronic problem
Tong doors fail to open
Rotary jams when making or
breaking casing
Restriction in hydraulic lines to
power unit
Faulty shifting mechanism
Broken gear
Power unit flow rate too low
Reservoir oil level low
Tong motor wear
Excessively worn or broken guide
roller or idler gear bearing
Faulty control valve
Locator pin improperly adjusted
Groove worn in shifting shaft (by
locator pin)
Worn motor shaft
Faulty shaft seal
Blown shaft seal or gasket
Plugged case drain
Rotary is not in proper position
Rotary plunger not functioning
Improperly adjusted guide rollers
Rotary plunger in pocket when
torque was applied, or torque
was applied too rapidly, not
allowing plunger to depress
Check hydraulic connections and
lines for restrictions and obstructions
Check shifting mechanism and repair
as necessary
Check for broken gear and replace
as necessary
Check power unit
Check oil level
Check motor
Replace guide roller or idler gear
bearing
Replace control valve
Adjust locator pin
Replace locator pin assembly
Replace motor
Replace motor seal
Replace seals or gasket
Disconnect end of case drain
Connected to valve and clear line
Align reversing pin with proper arrow
Clean, regrease and check for a point
of interference
Adjust guide roller shafts
If possible, back up rotary until rotary
plunger is in pocket (center front position).
Operate per tong hanging instructions in
"Installation." If rotary remains jammed,
remove tong from pipe as shown below.
Remove retainer bolt from bottom of each
door. Pull open door (opposite door with
jammed plunger), taking care to keep
rotary closed.
Placing a pry bar in space between jaws,
force top door plate open and off
jammed plunger, and open door.
Section 5 Page 2