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Warning.
Fine jets of hydraulic oil at high pressure can penetrate the skin.
Do not use your fingers to check for hydraulic oil leaks.
Do not put your face close to suspected hydraulic oil leaks
Hold a piece of cardboard close to the suspected leak and inspect the
cardboard to check for leaks.
If hydraulic oil penetrates your skin seek medical help immediately
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Removal and Replacement of a Final Drive from the machine
Below are some basic tips to help you to fit a new final drive and
connect the hydraulic hoses / pipes correctly. Don’t forget the
original machine manufacturers procedures should be followed where
possible.
Removing the old drive
- Remove the track and loosen the sprocket bolts.
- Tip: It is much easer to loosen the sprocket bolts before
removing the final drive.
- Remove the track motor cover plate from inside the
undercarriage frame.
- Sling the final drive and take the weight.
Caution: Final drives are very heavy
- Mark the hydraulic hoses so you can later identify them.
- Remove the hoses and cap them, plug the ports on the track
motor. It is very important to seal all hydraulic hoses and
ports to prevent contamination of the hydraulic system.
- From inside the track frame remove the bolts securing the
final drive to the frame.
- Swing out the final drive.
Tip. If the final drive is tight in the track frame do not hit
the travel motor in an attempt to free it. It will damage the
motor. Lever the final drive out from outside of the track
frame.
Fitting a new drive
Fitting a new final drive is the reverse of removal but pay
special attention when connecting the pipes as incorrect fitting can
cause an immediate failure of the travel motor.
Refer to the Bolt Torque Settings page of this web site when
tightening bolts
Pipe connections
How many? There may be 2, 3, 4 or sometimes 5 hydraulic connections
to a travel motor and gearbox.
What are they for?
- Two hydraulic lines are required to power the motor. These
are the “Flow and Return” lines.
- A case drain / Leak-off. Very important to connect this
correctly — See below.
- A two speed line to control the travel motor speed.
- A brake line. If fitted it is usually connected to the
gearbox rather than the travel motor.
ATTENTION Case drain — Leak-off. All piston type
hydraulic motors leak oil from the barrel and piston assembly
(sometimes called the rotating group assembly) into the motor
casing. This leakage is deliberate and lubricates the piston
slippers and swash plate (or thrust plate) as well as the interface
between the valve plate (or lens plate) and the cylinder block. The
oil that leaks into the motor casing has to find it’s way back to
the tank under very little pressure and a leak-off pipe (or drain
line) runs from the travel motor to the hydraulic tank for that
purpose. If the leak-off pipe is not connected or becomes blocked or
pressurised, oil pressure will build up in the motor casing and can,
and usually does, cause catastrophic damage to the travel motor and
often the final drive gearbox. It is therefore vital to ensure that
the leak-off pipe is connected correctly, is not obstructed and has
no significant back pressure.
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Airman |
Atlas |
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Komatsu |
Kubota |
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Bobcat |
Case |
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Libra |
Link Belt |
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Caterpillar |
Chieftan |
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Macmoter |
Manitou |
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Daewoo |
FAI |
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Minix |
Mitsubishi |
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Fermec |
Gale |
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Neuson |
Nissan |
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Halla |
Hanix |
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O&K |
Pel Job |
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Hitachi |
Hyundai |
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Powerfab |
Samsung |
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IHI |
JCB |
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Scattrak |
Schaeff |
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John Deere |
Kato |
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Sumitomo |
Takeuchi |
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Kobelco |
Koehring |
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Thomas |
Volvo |
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Yanmar |
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Ygri |
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Meet the family!
Just some of the huge range of Final Drives and
Travel Motors in our stock |
FACT BOX
The Final Drive Centre: Repairs hundreds of planetary and RV
type rotating case gearboxes every year. We recognize that the life
of a final drive gearbox is generally proportional to the frequency
of its oil changes.
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