Deutscher GARDEN CHIPPER 750, Operation And Maintenance Manual

Page: 17 / 24

17
MAINTENANCE
DeTaileD mainTenanCe
Tools required:
• 5mm Allen Key
• 8mm ring spanner and a ratchet wrench with 13mm and 17mm sockets.
• 16mm open ended spanner or equivalent shifting spanner.
• 9/16 AF open ended or ring spanner (For disc removal only)
• 3/8” open ended spanner. (Pulley removal)
• Soft headed hammer.
General
The rotor assembly should be inspected after every 50 hours of use or after a solid impact,
by removing the sloping cover plate above the discharge chute, removing the belt cover
and then the drive belt (as described on pages 15 & 16). While turning the rotor drive pulley
rapidly (by hand) and observing the edge of the rotor disc, you should be able to detect any
measurable bend in the disc assembly. If the side movement is greater than 1mm each way,
the machine will need to be dismantled.
Dismantling the chipper for engine replacement and rotor repair/ replacement.
• Switch off the engine, turn off the fuel tap and remove the spark plug lead from the spark
plug.
• Remove the hopper.
• Disengage the clutch, remove the belt cover and the drive belt.
• Remove the engine by firstly unplugging the lead from the microswitch (the plug is on
the side of the engine near the clutch handle), then removing the four bolts securing the
engine to its base plate. Lift the engine off the unit.
• Remove the discharge chute.
• Remove the four screws attaching the chassis to the base frame, then (with assistance)
lift the unit from the base frame.
• Remove the ten 10mm nyloc nuts that join the two halves of the chipping chamber
together.
• Gently tap the two halves of the chassis apart, using a soft hammer or similar and working
around the chassis in stages.
Disc replacement
Complete the dismantling described above.
• Remove the three 3/8” UNC nyloc nuts from behind the rotor disc using a long 9/16 AF
open ended or ring spanner and a 5mm Allen Key.
• Gently tap the rotor assembly from the end of the rotor spindle.
• Remove the chipper blades as described above.
• Remove the fan blades using a 5mm allen key and a 13mm spanner.
• When replacing the disc, first attach the fan blades and ensure they are oriented as
shown below.
• Attach the replacement disk to the spindle. Use new 3/8” UNC countersunk screws
if the rotor was damaged, as they may be weakened. The countersunk screws are
threaded into the disc. Ensure they are fully tightened with the 5mm allen key before
attaching new 3/8” UNC nyloc nuts. HOLD THE SCREWS FIRMLY WITH THE ALLEN
KEY AS THE NYLOC NUTS ARE TIGHTENED, OTHERWISE THE DISC WILL BE LOOSE
ON THE SPINDLE.