Troubleshooting 11
MCPBH-B (Rev. 4/20/2007)
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
Bucket function adjustment is
required to control the planer
attitude.
Both primary and secondary
bucket pins are installed between
the planer and backhoe boom.
Remove the secondary bucket pin
while planing to allow the planer to
freely swing about the primary pin.
No boom motion is available
when the planer is engaged.
Some hammer kits do not provide
a minimum flow at all times to the
boom when kit is engaged.
Install a priority flow divider
between the loader valve and kit
control valve (consult the planer
manufacturer).
In addition, when using the
extendahoe for planer power and
no load is present on the drum, all
the backhoe flow will go through
the planer.
Slightly disengage the extenda-
hoe function to allow pressure to
develop for boom motion.
Motor shaft seal leaks hydraulic
fluid.
The casedrain line is blocked or
crimped, creating more than 25 psi
at the drive motor case.
NOTE: Shaft seal failure may fill
planetary gearbox with the hydrau-
lic oil and may fail the planetary
seal. Change the planetary oil and
inspect for seal leakage if the
motor seal failure occurs.
Check the casedrain line from the
planer back to the hydraulic tank to
ensure that no more than 25 psi is
at the planer. Replace the shaft
shield.
Gear lube (90W) leak at the
planetary shaft.
Main planetary seal failure.
Replace the planetary seal.
The cold planer chatters while
milling and does not cut to the
desired depth.
Insufficient down pressure applied
through the backhoe boom.
Using the boom and dipper func-
tions, always apply enough down
pressure to maintain all the planer
needs on the pavement.
