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325, 328 Mini Excavator Service Repair Manual G Series
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6901138 (2-06) Printed in U.S.A. © Bobcat Company 2006
Service
Manual
S/N 232511001 & Above
S/N 232411001 & Above
(D Series)
325
328


MAINTENANCE SAFETY
Never service the Bobcat
Hydraulic Excavator without
instructions.
Have good ventilation when
welding or grinding painted
parts.
Wear dust mask when grinding
painted parts. Toxic dust and gas
can be produced.
Stop, cool and clean engine of
flammable materials before
checking fluids.
Never service or adjust machine
with the engine running unless
instructed to do so in the
manual.
Avoid contact with leaking
hydraulic fluid or diesel fuel
under pressure. It can penetrate
the skin or eyes.
Never fill fuel tank with engine
running, while smoking or when
near open flame.
MSW21-0805
Vent exhaust to outside when
engine must be run for service.
Exhaust system must be tightly
sealed. Exhaust fumes can kill
without warning.
Keep body, jewelry and clothing
away from moving parts,
electrical contact, hot parts and
exhaust.
Wear eye protection to guard
from battery acid, compressed
springs, fluids under pressure
and flying debris when engines
are running or tools are used.
Use eye protection approved for
type of welding.
Keep rear door closed except for
service. Close and latch door
before operating the excavator.
Always lower the bucket and
blade to the ground before doing
any maintenance.
Never modify equipment or add
attachments not approved by
Bobcat Company.
Lead-acid batteries produce
flammable and explosive gases.
Keep arcs, sparks, flames and
lighted tobacco away from
batteries.
Batteries contain acid which
burns eyes or skin on contact.
Wear protective clothing. If acid
contacts body, flush well with
water. For eye contact flush well
and get immediate medical
attention.
Cleaning and maintenance are
required daily.
B-10731a
CORRECT
B-15797
CORRECT
B-15798
CORRECT
WRONG
B-15799
WRONG
B-15800
WRONG
B-15801
WRONG
B-15802
WRONG
B-16102
B-15780
WRONG
B-6589
WARNING
Instructions are necessary before operating or servicing machine. Read and
understand the Operation & Maintenance Manual, Operator’s Handbook and
signs (decals) on machine. Follow warnings and instructions in the manuals
when making repairs, adjustments or servicing. Check for correct function after
adjustments, repairs or service. Untrained operators and failure to follow
instructions can cause injury or death. W-2003-0903
Maintenance procedures which are given in the Operation & Maintenance Manual can be performed by the owner/
operator without any specific technical training. Maintenance procedures which are not in the Operation & Maintenance
Manual must be performed ONLY BY QUALIFIED BOBCAT SERVICE PERSONNEL. Always use genuine Bobcat
replacement parts. The Service Safety Training Course is available from your Bobcat dealer.
Safety Alert Symbol: This symbol with a warning statement, means: “Warning, be alert! Your safety is
involved!” Carefully read the message that follows.
Use the correct procedure to lift
and support the excavator.
Always lift the blade fully before
installing jackstands.


325, 328 Excavator
Service Manual
ALPHABETICAL INDEX
AIR CLEANER ........................................................ 60-01
AIR CLEANER SERVICE ....................................... 10-01
ALTERNATOR ....................................................... 50-01
ARM ....................................................................... 40-01
ARM CYLINDER .................................................... 20-01
BATTERY ................................................................ 50-01
BLADE ................................................................... 30-01
BLADE CONTROL .................................................. 40-01
BLADE CYLINDER ................................................. 20-01
BOOM ..................................................................... 40-01
BOOM CYLINDER .................................................. 20-01
BOOM OFFSET CYLINDER................................... 20-01
BUCKET ................................................................. 40-01
BUCKET CYLINDER .............................................. 20-01
CAB......................................................................... 40-01
CASE DRAIN FILTER ............................................ 20-01
CLAMP.................................................................... 40-01
CONVERSIONS ............................................... SPEC-01
CONTROL LINKAGE ASSEMBLY .......................... 40-01
CONTROL PATTERN SELECTOR VALVE ............ 20-01
CROSSPORT RELIEF VALVE ............................... 20-01
DIAGNOSTICS SERVICE CODE ........................... 50-01
DIRECT TO TANK VALVE ...................................... 20-01
ELECTRICAL SYSTEM INFORMATION ................ 50-01
ENGINE .................................................................. 60-01
ENGINE COMPONENTS AND TESTING .............. 60-01
ENGINE COOLING SYSTEM ................................. 10-01
ENGINE FLYWHEEL .............................................. 60-01
ENGINE LUBRICATION SYSTEM.......................... 10-01
ENGINE SPECIFICATIONS............................... SPEC-01
ENGINE SPEED CONTROL .................................. 40-01
FLOORMAT AND FLOOR PANELS ....................... 40-01
FUEL, COOLANT AND LUBRICANTS ............. SPEC-01
FUEL LEVEL SENDER........................................... 50-01
FUEL SYSTEM ....................................................... 10-01
FUEL TANK............................................................. 40-01
HEATER ................................................................ 70-01
HEATER AIR FILTERS .......................................... 10-01
HEATER COIL ....................................................... 70-01
HEATER FAN ......................................................... 70-01
HEATER VALVE ..................................................... 70-01
HORN .................................................................... 40-01
HYDRAULIC CONNECTION SPECS ................ SPEC-01
HYDRAULIC CONTROL VALVE (S/N 232312386 &
BELOW, 232412117 & BELOW, 232412128 &
232412129 .............................................................. 20-01
HYDRAULIC CONTROL VALVE (S/N 232312387 &
ABOVE, 232412118-232412127 & 232412130 &
& ABOVE ................................................................ 20-01
HYDRAULIC EXCAVATOR SPECS ................... SPEC-01
HYDRAULIC FLUID SPECIFICATIONS ............ SPEC-01
HYDRAULIC FILTER .............................................. 20-01
HYDRAULIC PUMP ................................................ 20-01
HYDRAULIC RESERVOIR ..................................... 20-01
HYDRAULIC SYSTEM ........................................... 10-01
HYDRAULIC SYSTEM INFORMATION ................. 20-01
LEFT CONTROL LEVER (JOYSTICK)(S/N 232312386 &
BELOW, 232412117 & BELOW 232412128 &
232412129) ............................................................. 20-01
LEFT CONTROL LEVER (JOYSTICK)(S/N 232312387 &
ABOVE, 232412118-232412127 & 232412130
& ABOVE) ................................................................ 20-01
LEFT CONSOLE ..................................................... 40-01
LIFTING AND BLOCKING THE EXCAVATOR ........ 10-01
LIFTING THE EXCAVATOR .................................... 10-01
LIGHTS.................................................................... 50-01
LUBRICATING THE EXCAVATOR .......................... 10-01
MAIN RELIEF VALVES............................................ 20-01
MANIFOLD ASSEMBLY .......................................... 20-01
MANIFOLD ASSEMBLY/ACCUMULATOR ............. 20-01
MICROSWITCH ..................................................... 50-01
MUFFLER ............................................................... 60-01
OIL COOLER........................................................... 20-01
OPERATOR CAB (ROPS/TOPS) ............................ 10-01
PORT RELIEF VALVES........................................... 20-01
PRESSURE REDUCING VALVE............................. 20-01
RADIATOR...............................................................60-01
RECONDITIONING THE ENGINE .........................60-01
RIGHT CONTROL LEVER (JOYSTICK)
(S/N 232312386 & BELOW, 232412117 & BELOW
232412128 AND 232412129) ..................................20-01
RIGHT CONTROL LEVER (JOYSTICK)
(S/N 232312387 & ABOVE, 232412118-232412127
AND 232412130 & ABOVE) ....................................20-01
RIGHT CONSOLE ................................................... 40-01
RIGHT PEDAL AND LINKAGE ............................... 40-01
RIGHT SIDE COVER..................... .........................40-01
ROPS CANOPY.......................................................40-01
STANDARD SEAT AND MOUNT ........................... 40-01
SUSPENSION SEAT AND SEAT MOUNT ............. 40-01
SERVICE SCHEDULE ............................................10-01
SPARK ARRESTOR MUFFLER.. ............................10-01
STARTER ................................................................ 50-01
SWING CIRCLE GEAR ........................................... 30-01
SWING FRAME ....................................................... 40-01
SWING LOCK.......................................................... 10-01
SWING MOTOR ..................................................... 20-01
SWING MOTOR DRIVE CARRIER .........................20-01
SWIVEL JOINT .......................................................20-01
TAILGATE ..................................................... 10-01, 40-01
TORQUE SPECIFICATIONS ............................SPEC-01
TRACKS .................................................................. 30-01
TRACK DAMAGE IDENTIFICATION....................... 30-01
TRACK FRAME ...................................................... 30-01
TRACK IDLER ........................................................30-01
TRACK ROLLER .....................................................30-01
TRANSPORTING THE EXCAVATOR...................... 10-01
TRAVEL CONTROLS .............................................. 40-01
TRAVEL MOTOR.......................................... 10-01, 20-01
TROUBLESHOOTING ............................................ 60-01
TWO SPEED SWITCH ............................................ 50-01
UPPERSTRUCTURE .............................................. 40-01
X-CHANGE™ .........................................................40-01

325, 328 Excavator
Service Manual

325, 328 Excavator
Service Manual

325, 328 Excavator
Service Manual

325, 328 Excavator
I Service Manual
CONTENTS
FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III
SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
SERIAL NUMBER LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX
DELIVERY REPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX
BOBCAT EXCAVATOR IDENTIFICATION . . . . . . . . . . . . . . . . . . . . X
SAFETY AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . 10-01
HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-01
UNDERCARRIAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-01
UPPERSTRUCTURE & SWING SECTION . . . . . . . . . . . . . . . . 40-01
ELECTRICAL SYSTEM AND ANALYSIS . . . . . . . . . . . . . . . . . . 50-01
ENGINE SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60-01
HEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70-01
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPEC-01
SAFETY &
MAINTENANCE
HYDRAULIC
SYSTEM
UNDERCARRIAGE
UPPERSTRUCTURE
& SWING SECTION
ELECTRICAL
SYSTEM &
ANALYSIS
SERVICE
ENGINE
HEATER
SPECIFICATIONS

325, 328 Excavator
II Service Manual
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Get the comprehensive service repair manual for the 325 and 328 Mini Excavators by Bobcat. This manual covers the 325 excavator with serial number 234111001 and above, as well as the 328 excavator with serial number 234211001 and above, both belonging to the G Series.