Doosan D20S-5 Operation & Maintenance Manual page 189

Carriage Chain Adjustment Carriage Chain Adjustment
Make sure that carriage height is correct. If correct, Make sure that carriage height is correct. If correct,
adjust the chain for equal tension. If not, adjust the adjust the chain for equal tension. If not, adjust the
chain for correct carriage height by adjusting chain for correct carriage height by adjusting
anchor nuts (1), (2). anchor nuts (1), (2).
NOTE: See the previous section, "Carriage Roller NOTE: See the previous section, "Carriage Roller
Extrusion" in "When Required" for proper Extrusion" in "When Required" for proper
height of carriage. height of carriage.
1. 1. Fully lower the carriage and tilt mast forward or Fully lower the carriage and tilt mast forward or
lift the carriage and put blocks lift the carriage and put blocks under the carriage
to release the tension from the lift chains. to release the tension from the lift chains.
2. 2. Loosen nut(1) and adjust nut(2) to get proper Loosen nut(1) and adjust nut(2) to get proper
distance from bottom of inner upright to the distance from bottom of inner upright to the
bottom of carriage bearing. bottom of carriage bearing.
Typical example for carriage chain of STD mast Typical example for carriage chain of STD mast
Typical example for carriage chain of FF, FFT mast Typical example for carriage chain of FF, FFT mast
3. 3. Make adjustment anchor nut (1), (2) for equal Make adjustment anchor nut (1), (2) for equal
chain tension. chain tension.
4. 4. Set the mast vertical and raise the carriage and Set the mast vertical and raise the carriage and
check equal chain tension. If not equal, repeat check equal chain tension. If not equal, repeat
the same procedure as step 1 through step 3. the same procedure as step 1 through step 3.
5. 5. Put LOCTITE No. 242 Tread lock on the threads Put LOCTITE No. 242 Tread lock on the threads
of the anchor nuts (1), (2) after the adjustment is of the anchor nuts (1), (2) after the adjustment is
-186- -186-
Mast Chain Adjustment - FF, FFT Mast Mast Chain Adjustment - FF, FFT Mast
under the carriage
Typical example for FF mast Typical example for FF mast
Typical example for FFT mast Typical example for FFT mast
Make sure that mast height is correct. If correct, Make sure that mast height is correct. If correct,
adjust chain for equal tension. If not, adjust mast adjust chain for equal tension. If not, adjust mast
chain for correct mast height by adjusting anchor chain for correct mast height by adjusting anchor
nuts (3), (4). nuts (3), (4).
NOTE: See the previous section, "Carriage Roller NOTE:
1. 1. Lift the inner mast and put blocks under the inner
2. 2. Loosen nut (3) and adjust nut (4) to make inner
3. 3. Make adjustment anchor nuts (3), (4) for equal
4. 4. Raise the inner mast and check equal chain
5. 5. Put LOCTITE No. 242 tread lock on the threads
See the previous section, "Carriage Roller
Extrusion" in "When Required" for proper Extrusion" in "When Required" for proper
inner mast height. inner mast height.
Lift the inner mast and put blocks under the inner
mast to release the tension from the lift chains. mast to release the ten sion from the lift chains.
Loosen nut (3) and adjust nut (4) to make inner
mast rail flush with outer mast rail bottom. mast rail flush with ou ter mast rail bottom.
Make adjustment anchor nuts (3), (4) for equal
chain tension. chain tension.
Raise the inner mast and check equal chain
tension. If not equal, repeat the same procedure tension. If not equal, repeat the same procedure
as step 1 through step 3. as step 1 through step 3.
Put LOCTITE No. 242 tread lock on the threads
of the anchor nuts (3), (4) after the adjustment is of the anchor nuts (3), (4) after the adjustment is
completed. completed.
Maintenance Section Maintenance Section