Doosan G20E-5, Operation & Maintenance Manual, Page: 189 / 210

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Maintenance Section Maintenance Section
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: NOTE: See the previous section, “Carriage Roller 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 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
completed.
completed.
Mast Chain Adjustment - FF, FFT Mast Mast Chain Adjustment - FF, FFT Mast
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: NOTE: See the previous section, “Carriage Roller See the previous section, “Carriage Roller
Extrusion” in “When Required” for proper Extrusion” in “When Required” for proper
inner mast height.
inner mast height.
1. 1. Lift the inner mast and put blocks under the inner Lift the inner mast and put blocks under the inner
mast to release the ten
mast to release the tension from the lift chains. sion from the lift chains.
2. 2. Loosen nut (3) and adjust nut (4) to make inner Loosen nut (3) and adjust nut (4) to make inner
mast rail flush with ou
mast rail flush with outer mast rail bottom. ter mast rail bottom.
3. 3. Make adjustment anchor nuts (3), (4) for equal Make adjustment anchor nuts (3), (4) for equal
chain tension.
chain tension.
4. 4. Raise the inner mast and check equal chain 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.
5. 5. Put LOCTITE No. 242 tread lock on the threads 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.