OM 28Z3 US – Edition 2.0 * 28Z3b410.fm 4-3
Troubleshooting
4.2 Malfunctions of the Powertilt unit
Engine oil consumption too high
Oil level too high/wrong oil 5-6
Worn oil scraper ring
Machine inclination too high
Engine smoke
Blue
Oil level too high/wrong oil 5-6
Machine inclination too high
White
Engine starting temperature too low
Fuel grade does not comply with specifications 5-34
Wrong valve clearance
Malfunctioning fuel injector
Malfunctioning cylinder-head gasket
Black
Dirty air filter 5-12
Wrong valve clearance
Malfunctioning fuel injector
Problem Possible causes See
Problem Possible causes See
Powertilt does not maintain its position.
If the excavator applies too much pressure against an obstacle, this
can build up pressure in the Powertilt swivel device that activates
the internal decompression valve.
Oil escapes from the control valve.
Defective decompression valve.
Oil escapes from the seals.
Powertilt turns only in one direction.
A one-way valve has been installed.
Malfunctioning internal decompression valve.
Both lines are connected to either the P1 or P2 ports of the Powertilt
swivel device.
Inexact lateral Powertilt movements.
Air in Powertilt swivel device or hydraulic system.
Hose/pipe diameter/length is larger/longer than recommended.
Reverse and eliminate movement of shaft in housing
(axial play of shaft).
Worn or missing pressure discs.
Lateral bucket movement. A little play due to necessary spacing between teeth is normal.
Grease cannot be applied to Powertilt grease nipples.
Malfunctioning grease decompression valve of lubrication system,
or grease decompression valve has been replaced by a grease nip-
ple or plug.
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