Toro 73551 Manual

The Toro Company – 1997
Printed in USA All Rights Reserved
FORM NO. 3319–230 A
SET UP
INSTRUCTIONS
MODEL NO. 73551–8900001 & UP
523Dxi GARDEN TRACTOR
Loose Parts
Note: Use the chart below to identify parts for assembly.
DESCRIPTION QTY. USE
Rear Wheel
Wheel Bolt
2
10 Installing the rear wheels
R.H. Wheel Spindle
L.H. Wheel Spindle
Unplated Thrust Washer – 1.56” O.D x .06”
Thick
Plated Wheel Washer –1.50” O.D x .05” Thick
Bolt – 5/16”-18 x 2.25” Long
Hex Nut – 5/16”-18
Spindle Cap
Front Wheel
Hubcap Washer – 2.50” O.D x .05” Thick
Cotter Pin –.156” x 1.50” Long
Shim Washer – 1.50” O.D x .015” Thick
Hubcap
1
1
2
4
2
2
2
2
2
2
2
2
Installing the front wheels
Steering Wheel
Boot Washer
Nut
Lock Washer
Trim Cover
1
1
1
1
1
Installing the steering wheel
Seat Assembly
Shoulder Bolt – 5/16”
Locknut – 5/16”
1
2
2Installing the seat

Set-Up Instructions
2
DESCRIPTION USEQTY.
Bolt – 1/4”-20 x .75” Long
Wing Nut – 1/4”-20
2
2Attaching the battery cables
Grill Screw – #8 x .50” Long
Grill Washer – .75” O.D.
2
2Securing the grill
Hitch Pin
Hairpin Cotter
Flat Washer – .50” I.D.
1
1
2Installing the drawbar hitch pin
Key 1Use in ignition switch
Operator’s Manual 1Read before operating the tractor
Engine Operator’s Manual 1Read before operating the tractor
Installing the Rear Wheels
1. Remove the four wheel bolts holding the rear
shipping brackets to the rear hubs.
2. Using a jack or suitable hoist, raise the rear of
the tractor only high enough to install the rear
wheels.
3. Install the wheels onto the hubs with the valve
stems facing inward (Fig. 1).
4. Tighten the wheel bolts to 75–80 ft-lb
(105–112 Nm).
m–1278
3
2
1
Figure 1
1. Hub
2. Rear wheel 3. Wheel bolt (5)
Installing the Front Wheels
IMPORTANT: Never raise the front of the
tractor by placing a jack under the bumper
or front axle because the tractor may be
damaged.
1. The front hood support braces have two slots
(Fig. 2) that may be used to lift the tractor to
install the front wheel spindles. To access these
slots, remove the front grill and raise the hood.
m–3454
11
2 2
Figure 2
1. Slots 2. Grill Grommets
Note: Remove, or be careful not to damage,
the two upper grill grommets (Fig. 2).

Set-Up Instructions
3
2. Using a suitable hoist, raise the front of the
tractor only high enough to install the front
wheel spindles.
IMPORTANT: Do not pivot the weight of the
tractor onto the rear drawbar hitch because
the hitch will be damaged.
3. Install a 1.56” O.D. x .06” thick unplated thrust
washer onto the splined shaft of the R.H. wheel
spindle (Fig. 4).
4. Install the splined end of the R.H. spindle
through the R.H. end of the front axle and into
the steering arm (Fig. 4).
Note: The L.H. and R.H. spindles are
different. Assemble the spindles as
shown in figure 3.
Note: The outside edge of the spindle must
be parallel to the end of the steering
arm (Fig. 3).
m–3610
3
2
1
4
Figure 3
1. R.H. Spindle
2. L.H. Spindle 3. Steering arm 4. Parallel relationship
5. Secure the spindle shaft to the steering arm with
a 5/16”–18 x 2.25” bolt and 5/16” nut (Fig. 4).
Torque the nut to 230 25 in–lbs.
6. Insert a 1.50” O.D x .05” thick plated wheel
washer onto the R.H. spindle (Fig. 4).
7. Install a front wheel onto the R.H. spindle with
the valve stem facing inward (Fig 4).
8. Insert another 1.50” O.D x .05” thick plated
wheel washer onto the R.H. spindle (Fig. 4).
9. Install a 2.50” O.D x .05” thick hub cap washer
onto the spindle. Now insert a .156 x 1.50” long
cotter pin into the hole in the spindle (Fig. 4).
10. Check the front wheel end play. Install shim
washers inside the hubcap washer as necessary
so there is minimum end play.
1
5
2
6
8
8
11
m–3452
3
4
910
12
7
Figure 4
1. Wheelspindle
2. Unplated thrust washer
1.56” x .06” thick
3. Front axle
4. Steering arm
5. Bolt 5/16”–18 x 2.25”
6. Nut 5/16”
7. Spindle cap
8. Plated wheel washer 1.50”
O.D. x .05” thick
9. Hub cap washer 2.50”
O.D. x .05” thick
10. Shim washer 1.50” O.D. x
.015” thick
11. Cotter pin .056” x 1.50”
12. Hubcap
11. Secure the wheel to the spindle with a cotter pin.
Bend the ends of the cotter pin completely
around the spindle.
12. Install a hubcap onto the hubcap washer until it
snaps in place (Fig. 4).

Set-Up Instructions
4
13. Look at the end of the steering arm and the
inside edge of the tire. The end of the steering
arm and the inside edge of the tire must be
parallel (Fig. 5). Adjust the steering arm if
required.
m–3451
1
2
3
Figure 5
1. Wheel
2. Steeringarm 3. Parallel relationship
14. Insert a spindle cap into the steering arm
(Fig. 4).
15. Repeat the procedure on the opposite end of the
front axle.
16. After servicing the battery, replace the front grill
of the tractor and secure the grill with two #8 x
.50” long grill screws and .75” O.D. grill
washers in the upper two grill mounting holes
(Fig. 6).
m–3558
1
2
Figure 6
1. Grill screw (1 of 2) 2. Grill washer (1 of 2)
17. Lubricate the spindles and front axle pivot until
grease begins to come out of the bearings.
18. With the tractor on a level surface, check to
make sure the front wheel toe-in is between 1/8”
and 1/4”. For instructions on adjusting toe-in,
refer to the Maintenance section in Operator’s
Manual.
Checking Tire Pressure
Check front and rear tire pressure. The correct front
and rear tire pressure is 12 psi (82.7 kPa).

Set-Up Instructions
5
Installing the Seat
1. Mount the seat to the seat base using two 5/16”
shoulder bolts and lock nuts (Fig. 7).
2. Insert the seat switch wire through the center
opening in the seat base (Fig 7).
3. Push the seat switch wire connector into the wire
harness connector.
1
2
5
m–3453
3
4
6
Figure 7
1. Seat
2. Seat base
3. 5/16” shoulder bolt (2)
4. 5/16” Locknut (4)
5. Seat switch wire
connector
6. Opening for seat switch
wire
Installing the Steering Wheel
1. Install the boot washer onto the steering shaft
(Fig. 8).
2. Remove the plastic trim cover from the steering
wheel (Fig. 8)
3. Install the steering wheel onto the shaft,
carefully aligning the splines (Fig. 8).
Note: There is no fixed straight ahead
position on power steering models.
4. Secure the steering wheel to the shaft with a lock
washer and nut (Fig. 8). Tighten the retaining nut
to 45–50 ft–lbs.
5. Install the trim cover on the steering wheel.
m–2482
1
3
2
4
5
6
Figure 8
1. Boot washer
2. Steering shaft
3. Steering wheel
4. Lock washer
5. Nut
6. Trim cover

Set-Up Instructions
6
Activating the Battery
POTENTIAL HAZARD
•Battery electrolyte contains sulfuric acid
which is a deadly poison and it causes
severe burns.
WHAT CAN HAPPEN
•If you carelessly drink electrolyte you could
die or if it gets onto your skin you will be
burned.
HOW TO AVOID THE HAZARD
•Do not drink electrolyte and avoid contact
with skin, eyes or clothing. Wear safety
glasses to shield your eyes and rubber
gloves to protect your hands.
•Fill the battery where clean water is always
available for flushing the skin.
•Follow all instructions and comply with all
safety messages on the electrolyte container.
1. Remove the battery from the tractor (refer to
Removing the Battery in your tractor Operator’s
Manual).
Note: Never fill the battery electrolyte with
the battery installed in the tractor.
2. Remove the cell cover from the battery. Slowly
pour electrolyte into each cell until the
electrolyte level is up to the lower part of the
tube (Fig. 9). Use an electrolyte with a specific
gravity of 1.265.
m–3799
3
2
1
Figure 9
1. Cell cover
2. Electrolyte 3. Lower part of tube
POTENTIAL HAZARD
•Charging battery produces gasses.
WHAT CAN HAPPEN
•Battery gasses can explode.
HOW TO AVOID THE HAZARD
•Keep cigarettes, sparks and flames away
from battery.
3. Leave the cell cover off and connect a 3–4 amp
battery charger to the battery posts (Fig. 10).
Charge the battery at a rate of 4 amperes or less
for 4 hours (12 volts).

Set-Up Instructions
7
4. When the battery is fully charged, unplug the
charger from electrical outlet, then disconnect
the charger leads from the battery posts
(Fig. 10).
4
1
23
m–3798
Figure 10
1. Positive battery post
2. Negative battery post 3. Red (+) charger lead 4. Black (–) charger lead
5. Slowly pour electrolyte into each cell until the
level is once again up to the lower part of the
tube (Fig. 9), then install the cell cover.
6. Install the battery in the tractor and connect the
battery cables (refer to Installing the Battery in
your tractor Operator’s Manual).
Note: Do not run the tractor with the battery
disconnected.
Installing the Drawbar Hitch
Pin
Insert the drawbar hitch pin into the drawbar hitch
and secure it with a .50” I.D. flat washer and hairpin
cotter (Fig. 11).
2
1
3
m–2481
4
Figure 11
1. Drawbarhitch pin
2. Drawbar hitch 3. .50” Flat washer 4. Hairpin cotter

Set-Up Instructions
8
Checking the Wiring and
Fasteners
•Inspect the tractor for any loose electrical
connections and secure them as required. Check
the wire routing to make sure moving parts do
not interfere with wires and cause a short.
•Assure all fasteners are tight.
Burnishing the Clutch
The following break–in procedure must be performed
as part of predelivery service or when a new clutch is
installed.
Note: There must be a PTO driven
attachment installed to provide a load
in order to burnish the clutch facings
properly.
1. Run the engine at full throttle and engage the
clutch bringing the load to full speed. Then
disengage the clutch.
2. Let the load come to a full stop, then engage
again.
3. Repeat these procedures (1 and 2) 5 times.
Test Driving the Tractor
1. Check the oil level in the crankcase (refer to
Engine Oil in your tractor Operator’s Manual for
oil type, viscosity and crankcase capacity).
2. Check the oil level in the transaxle (refer to
Transaxle Fluid in your tractor Operator’s
Manual for oil type, viscosity and capacity).
3. Check that the coolant level is between the two
lines on the coolant recovery tank when the
engine is cold (refer to Check the Cooling
System in your tractor Operator’s Manual).
4. Make sure all water is drained from the fuel filter
(refer to Draining Water From The Fuel
Filter/Water Separator in your tractor Operator’s
Manual).
5. Check to make sure all lubrication points have
been greased as shown in the Maintenance
section of tractor Operator’s Manual.
6. Fill the tank with fresh diesel fuel with a
minimum cetane rating of 40 and the proper
grade for the ambient temperature conditions
(refer to Adding Fuel in your tractor Operator’s
Manual) Open the fuel shutoff valve and check
the fuel hose and fittings for leaks.
7. As applicable, check and test the operation of the
following:
•Engine and throttle controls
•Gauges
•Headlights and taillights
•Indicator lights
•PTO clutch and brake
•Lift system
•Service and parking brakes
•Transmission controls
•Steering
•Tractor operation in forward and reverse
8. Test the operation of the safety interlock system
(refer to the tractor Operator’s Manual for the
correct procedure).