Great Dane GDSZ48-14KA - Manual (Page 5)

SERVICING & ADJUSTMENTS
TIRE PRESSURE
.When mowing on relatively smooth ground, keep rear wheel
tire pressure low, such as 14 to 16 psi. When mowing on
rough ground, increase
tire pressure to 20 to 24 psi. This will produce a nicer level of
cut.
.Note that the front caster wheels are foam filled and never
need air .
HEIGHT OF CUT
.Rear wheels may be located in three or four positions. Use
midpoint position for average cut from 2 to 4 inches. Highest
hole position to cut from 3 to 5 inches. Lowest hole position
to cut from 1 to 3 inches.
.Adjust caster wheel spacers to keep cutter deck tilted slightly
down at the front.
.Vary number of spacers between cutter blade
and spindle for higher height of cut.
BELT TENSION ADJUSTMENT
The belt drive from the engine to the hydro -'pumps is self
adjusting, normally requiring no
maintenance.
.The belt from the engine to the cutter deck and the right hand
spindle drive belt should be tightened only so that you can
deflect the belt about 1/2 inch when pulling about 10 Ibs. If
the belt is too tight, you may damage the engine or the
spindle bearings. Too loose, and the belt will wear
prematurely.
FREE WHEELING
.To move machine without having the engine running, rotate
the dump valve levers of the left hand side of the hydro
pump about one turn counterclockwise. Levers must be
returned to original closed position to drive the machine.
HYDRO AIR BLEED PROCEDURE
When any of the hydro components or hoses are
disconnected or removed and when the hydro oil is changed
entrapped air must be bled from the system.
Disconnect small hose line from each pump going to the oil
filter
.When oil starts to flow in a steady stream from end of hose,
plug the hose
.When oil starts to flow in a steady stream from disconnected
open port on the pump, reconnect hose to pump.
.Secure machine in a safe area, away from bystanders and
facing a wall. Raise drive wheels off the ground and block
caster wheels
Run full forward speed for about a minute and
then reverse speed for another minute. Continue
to cycle until cavitations sound quiets down and full power is
restored.
SPINDLE DISASSEMBLY
To replace ball bearings in the spindle assembly, there is no
need to remove assembly from cutter deck
.Carefully clean all debris around the spindle assembly
.Remove the blade, bolt and flanged nut
.Slide off pulley and spacer washer. If pulley is seized on spline
shaft, soak with solvent. Do not use hammer or wheel puller
.Remove wire clip ring at top of bearing around the shaft. Use
sharp tool to extract
.Lower the entire shaft from the bottom of the spindle with
lower bearing and spacer sleeve
.Discard old bearings at this time.
.Clean entire assembly
.Reinstall in reverse order. Place new bearing on shaft lower
flange, slide on the spacer sleeve
.Slide the shaft assembly up into the spindle housing keeping
shaft carefully centered. The lower bearing can easily bind
since clearance is only .002 inch. Do not hammer into
position. If the bearing seizes, take apart again and carefully
reposition until the assembly slides easily and smoothly into
housing
.Carefully center and install top bearing
.Insert wire clip, any spacers and pulley
BATTERY SERVICING
.Carefully fill each cell to the proper level with electrolyte,
observing great caution when handling acid. Severe chemical
burns may
result.
.Charge battery in open, well ventilated area and use proper
procedure specified with the charging system.
.After neutralizing any acid spills, install battery and securely
tighten wires.