Toro 73590 Parts Catalogue
Wheel Horse
523Dxi Garden Tractor
Model No. 73590–230000001 and Up
Form No. 3328–748
Parts Catalog
Ordering Replacement Parts
To order replacement parts, please supply: the part
number, the quantity, and the description of each
part desired.
Understanding Reference Numbers
Each identified part in an illustration has a reference
number. The reference number for a part also appears in
the parts list, along with other information about the part.
This catalog uses two special reference number formats,
one to indicate parts in a service assembly and another
to indicate the quantity of a given part in an illustration.
Service Assembly Reference Numbers
Parts in service assemblies have reference numbers in
the form a:b.
the entire service assembly and the b represents a
sequential number unique to each part within the service
assembly.
The a represents the reference number of
The TORO Company — 2003
All Rights Reserved
For example, a wheel assembly might be identified by
reference number 6, the tire by 6:1, the valve by 6:2,
and the wheel by 6:3. When you order the assembly
identified by reference number 6, you receive all parts
identified by reference numbers 6:1, 6:2, and 6:3.
However, you may also order any part individually.
Reference numbers of this type appear in illustrations
and in part lists.
Reference Numbers Indicating Quantity
In an illustration, if a reference number indicates more
than one part, the reference number has the form nX y.
The n represents the quantity of the part, the X is the
multiplication symbol, and the y represents the reference
number.
For example, in an illustration, the reference number
2X 37 means that two of the parts identified by reference
number 37 are indicated.
3328–748
Contents
Description Page Description Page
Bumper & Hood Support 3. . . . . . . . . . . . . . . . . . . . .
Steering Tower & Fuel Tank Supports Assembly 4.
Attach–A–Matic & Hitch Assembly 5. . . . . . . . . . . . .
Power Steering Lower Assembly 6. . . . . . . . . . . . . .
Power Steering & Tilt Assembly 7. . . . . . . . . . . . . . .
Tie Rods, Spindle & Front Axle Assembly 8. . . . . . .
Hydro Transaxle Assembly 9. . . . . . . . . . . . . . . . . . .
Hydro Trans Axle Assembly (cont.) 10. . . . . . . . . . .
Hydro Transmission No. 94–2003 11. . . . . . . . . . . .
Hydro Transmission No. 94–2003 12. . . . . . . . . . . .
Drive Shaft Assembly 13. . . . . . . . . . . . . . . . . . . . . . .
Hydro Lift Lower Assembly 14. . . . . . . . . . . . . . . . . .
Hydro Lift Upper Assembly 15. . . . . . . . . . . . . . . . . .
Hood & Headlight Assembly 16. . . . . . . . . . . . . . . . .
Grill & Side Panels Assembly 17. . . . . . . . . . . . . . . .
Dash Assembly 18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fender, Footrest, & Seat Assembly 19. . . . . . . . . . .
Smart Turn Rear Assembly 21. . . . . . . . . . . . . . . . . .
Hi–Lo Shift Assembly 22. . . . . . . . . . . . . . . . . . . . . . .
Parking Brake Upper Assembly 23. . . . . . . . . . . . . .
Hydro Controls Assembly 24. . . . . . . . . . . . . . . . . . .
Smart Turn Front Assembly 25. . . . . . . . . . . . . . . . . .
Parking Brake Lower Assembly 26. . . . . . . . . . . . . .
Cruise Control Assembly 27. . . . . . . . . . . . . . . . . . . .
Fender & Fuel System Assembly 28. . . . . . . . . . . . .
Wheel Assembly 29. . . . . . . . . . . . . . . . . . . . . . . . . . .
Separator–Filter/Water Assembly
No. 63–7650 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Liquid Cooled Diesel Engine Assembly 31. . . . . . . .
Liquid Cooled Diesel Engine Assembly (cont.) 32. .
Liquid Cooled Diesel Engine Assembly (cont.) 33. .
Electrical 23HP Assembly 34. . . . . . . . . . . . . . . . . . .
Part Description Abbreviations
Part descriptions in this catalog may include the following abbreviations.
Abbreviation Meaning Abbreviation Meaning
AR as required. . . . . . . . . . . . . . . . .
ASM assembly. . . . . . . . . . . . . . . .
CARR carriage. . . . . . . . . . . . . .
DEG degrees. . . . . . . . . . . . . . . .
FH flat head. . . . . . . . . . . . . . . . .
GA gauge. . . . . . . . . . . . . . . . .
HF hex flange. . . . . . . . . . . . . . . . .
HH hex head. . . . . . . . . . . . . . . . .
HHF hex head flange. . . . . . . . . . . . . . . .
HLH hex lag head. . . . . . . . . . . . . . . .
HJ hex jam. . . . . . . . . . . . . . . . . .
HOC height-of-cut. . . . . . . . . . . . . . . .
HS hex socket. . . . . . . . . . . . . . . . .
HSBH hex socket button head. . . . . . . . . . . . . .
HSFH hex socket flat head. . . . . . . . . . . . . . .
HSH hex socket head. . . . . . . . . . . . . . . .
HWH hex washer head. . . . . . . . . . . . . . .
HWHTF hex washer head. . . . . . . . . . . . .
thread forming
HYD hydraulic. . . . . . . . . . . . . . . .
INC incorporated. . . . . . . . . . . . . . . . .
LH left hand. . . . . . . . . . . . . . . . .
NI nylon insert. . . . . . . . . . . . . . . . . .
PPH Phillips pan head. . . . . . . . . . . . . . . .
PTH Phillips truss head. . . . . . . . . . . . . . . .
PTO power take off. . . . . . . . . . . . . . . .
RH right hand. . . . . . . . . . . . . . . . .
SFH slotted fillister head. . . . . . . . . . . . . . . .
SHH slotted hex head. . . . . . . . . . . . . . . .
SQH square head. . . . . . . . . . . . . . . .
SHWH slotted hex washer head. . . . . . . . . . . . . .
SPH slotted pan head. . . . . . . . . . . . . . . .
SRH slotted round head. . . . . . . . . . . . . . . .
STD standard. . . . . . . . . . . . . . . .
TAP self tapping. . . . . . . . . . . . . . . .
TTH Torx truss head. . . . . . . . . . . . . . . .
WH wing head. . . . . . . . . . . . . . . . .
2
3328–748
1
2X 2
2X 2
2X 12
1
3
3
4
5:2
5
1
2X 4
22
21
6
4X 12
21
17
22
4
7
2
2X 8
4
19:2
2X 7
2X 10
1
20
2X 4
19
4X 12
18
7
Bumper & Hood Support
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 95–4013 4 Latch ASM
2 107069 6 Clip
3 3256–23 12 Washer–Flat
4 322–3 11 Screw–HH
5 98–5070 1 Support ASM
5:2 98–5015 1 Decal – Warning
6 98–9026–03 1 Bracket–Hinge, Lower
LH
7 95–3989 4 Mount–Sidepanel
8 94–7910 4 Grommet
9 95–4082–03 1 Support–Hood LH
10 46–8093 4 Screw–Plastite
11 99–5305 1 Support–Hood ASM
11:2 95–4258 1 Cover – Brace
11:3 614249 2 Strap–Tie
12 3296–29 16 Nut–Lock, NI
13 94–2308–03 1 Bumper – Frame
14 323–7 4 Screw–HH
15 95–4081–03 1 Support–Hood RH
16 98–9027–03 1 Bracket–Hinge, Lower
RH
17 3230–16 4 Screw–CARR
18 3296–39 4 Nut–Lock, NI
19 99–5344 1 Support ASM
19:2 98–5015 1 Decal – Warning
9
10
11:3
24
2
10
16
4X 3
4X 12
15
2X 8
2X 3
23
2X 4
25
14
2X 3
2X 12
2X 3
2X 4
13
28
11
26
27
11:2
Sheet No.:3
20 92–8747 2 Decal–Attach–A–Mat
ic
21 3256–61 2 Washer–Flat
22 32144–42 2 Screw–HH
23 98–1617 1 Clamp–Tube
24 93–8069 2 Decal–Surface, Hot
25 322–5 1 Screw–HH
26 98–9015 1 Lever – Hood Prop
27 37–8771 1 Bolt–Shoulder
28 3296–47 1 Nut–Lock, NI
3
3328–748
40
39
38
37
36
2X 3
2
4X 7
2X 3
35
4X 3
2X 17
5
4
6
7 2X 8 1916
92X 10
6X 8
12
43112
15
11
2X 12
30
14:2
14:1
3
2X 41
14
13
42
31
2X 17
32
29
41
17 21 22201810
28
27
26
25
24
23
34
33
2X 8
Steering Tower & Fuel Tank Support Assembly
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 3231–25 2 Screw–CARR
2 94–7740–03 1 Support–Gas Tank
3 3296–39 12 Nut–Lock, NI
4 94–2413 4 U–Nut
5 323–7 4 Screw–HH
6 2844 1 Washer
7 3235–22 5 Screw–HH Lock
8 107069 10 Clip
9 95–3961–03 1 Support – Fuel Tank
10 3296–29 3 Nut–Lock, NI
11 99–1939 1 Module–Low Fuel
12 32144–112 4 Screw–HWHTF
13 95–3991 1 Filter – Hydraulic
Screen
14 95–4138 2 Fitting–HYD. Straight
14:1 237–22 1 O–Ring
14:2 237–42 1 O–Ring
15 99–3703 1 Module–Cruise
16 105797 1 Ring–Retaining
17 3256–24 5 Washer–Flat
18 95–3892–03 1 Bracket – Latch
19 95–4165 1 Spring – Latch Lever
20 95–3899 1 Lever–Latch
21 95–3900 1 Latch – Tension Lever
22 37–8771 1 Bolt–Shoulder
23 95–3895 1 Spring – Latch Lever
3
2X 3
Sheet No.:4
24 321–4 3 Screw–HH
25 3253–3 3 Washer–Lock
26 3256–22 3 Washer–Flat
27 2412–106 1 Clamp–R
28 3256–22 1 Washer–Flat
29 3296–42 1 Nut–Lock, NI
30 3229–1 1 Screw–CARR
31 94–7971 1 Tube – Hydraulic
32 99–4441–03 1 Tower ASM
33 321–4 2 Screw–HH
34 95–4246 1 Baffle – Fan
35 3230–20 2 Screw–CARR
36 99–5306–03 1 Frame
37 323–4 2 Screw–HH
38 95–4005–03 1 Cover – Rear
39 94–7972 1 Screw – HH
40 94–7739–03 1 Strap–Torque
41 323–6 4 Screw–HH
42 32115–15 1 Pushnut–Retainer,
Bolt
43 99–3701 1 Module–Clutch
4
3328–748
2
4
3
1
37
5
1
6
7
3X 12
3X 8
9
10
12
3X 13
30
2X 11
2X 12
2X 12
2X 13
2X 13
34
33
20
30
12
3X 8
14
32
3X 12
17
19
18
17
7
31
10
Attach–A–Matic & Hitch Assembly
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 5618 2 E–Ring
2 105269 1 Pin–Stationary Hitch
3 106634 1 Pin–Tool
4 9335054 1 Pin–Hair
5 9791204 2 Spacer
6 98–8083–03 1 Hitch
7 94–2251–03 2 Plate – Hitch
8 323–44 6 Screw–HH
9 98–1632 2 Decal –
Attach–A–Matic
10 3235–22 2 Screw–HH Lock
11 323–7 4 Screw–HH
12 3256–24 16 Washer–Flat
13 3296–39 14 Nut–Lock, NI
14 105316 3 Cap–Plunger Rod
15 94–2230–03 1 Hanger–RH
16 94–2231–03 1 Hanger – LH
17 105797 6 Ring–Retaining
18 94–2256 3 Rod – Lock
19 94–2258 3 Lock – Latch
20 8616 3 Spring
21 94–7777 2 Latch–Pulley Box
22 3290–221 2 Washer–Spring
23 92–7674 2 Bolt
24 323–6 2 Screw–HH
25 107069 2 Clip
35
29
2X 12
2X 12
2X 11
28
27
2X 18
2X 19
2X 20
21
26
25
24
23
22
2X 17
2X 14
15
16
2X 13
2X 17
Sheet No.:5
26 94–2304–03 1 Tray – Battery
27 3256–24 2 Washer–Flat
28 94–2233 2 Spacer
29 94–2475 1 Rod – Spacer
30 98–1629 2 Washer
31 9038 1 Grip
32 3230–2 2 Bolt–CARR
33 94–7855–03 1 Bracket–Mid Arm
34 3296–29 2 Nut–Lock, NI
35 94–2250–03 1 Latch
37 3256–26 1 Washer–Flat
5
3328–748
21:1
21:2
21
21
21:2
19
18
20
6
17
7
16
22
21:1
23
2
3
4
5
6
7
24
1
8
9
10
11
15
8
14
Power Steering Lower Assembly
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 323–7 2 Screw–HH
2 108881 1 Nut
3 99–1909 1 Cylinder–Power
Steering
4 94–7976 1 Screw–HH
5 98–3087 1 Washer
6 3296–39 4 Nut–Lock, NI
7 94–7819 2 Spacer – Stop
8 251–82 2 Bearing–Ball
9 94–2219 1 Spacer – Power
Steering
10 94–7581 1 Housing–Power
Steering
11 94–7820–03 1 Plate–Power Steering
12 323–15 1 Screw–HH
13 94–2142–03 1 Shaft–Sector
14 3256–42 1 Washer–Flat
15 323–10 1 Screw–HH
16 3296–29 4 Nut–Lock, NI
17 322–6 4 Screw–HH
18 94–7556 1 Arm–Power Steering,
Upper
19 2844 1 Washer
20 98–3052 1 Screw–Locking,
Thread
21 95–4136 2 Fitting – Hydraulic 45
2X 6
12
13
Sheet No.:8
21:1 237–42 1 O–Ring
21:2 237–21 1 O–Ring
22 99–2320 1 Spacer–Cylinder
23 323–9 1 Screw–HH
24 98–2358 1 Clamp – R
6
30
1:1
3328–748
1
29
28
27
26
3X 13
25
24
23
22
21
20
10:2
2
3
32
31
5
4
11
12
13
14
15
19
15:2
10
15
10:1
15:1
18
17:1
6
7
8
9
16
17:2
17
Sheet No.:9
Power Steering & Tilt Assembly
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 98–1474 1 Wheel–Steering
1:1 98–1468 1 Cover–Wheel,
Steering
2 92–6798 1 Cap–Rod, Tilt
3 95–3964 1 Lever–Tilt
4 94–2382 1 Bracket – Detent
5 3296–42 2 Nut–Lock, NI
6 95–3805 1 Spring
7 3229–1 2 Screw–CARR
8 94–7947 1 Assembly – Hose
9 94–7949 1 Hose–ASM
10 95–4137 1 Fitting – Hydraulic
Long
10:1 237–42 1 O–Ring
10:2 237–22 1 O–Ring
11 94–2451 1 Column–Power
12 33103–020 1 Screw–HHF
13 48–8020 4 Washer–Spring
14 94–7948 1 Hose–ASM
15 340–1 2 Adapter
15:1 237–35 1 O–Ring
15:2 237–42 1 O–Ring
16 95–3807 1 Hose ASM
17 95–4138 2 Fitting–HYD. Straight
17:1 237–22 1 O–Ring
17:2 237–42 1 O–Ring
18 94–7946 1 Hose ASM
19 94–7567 1 Control Unit–Power
Steering
20 3296–29 2 Nut–Lock, NI
21 94–7599–03 1 Bracket–Pivot
22 94–7582 1 Bolt – Shoulder
23 108881 1 Nut
24 322–6 2 Screw–HH
25 94–7521–03 1 Pivot–Power String
26 33103–025 3 Screw–HHF
27 94–2025 1 Washer – Boot
28 69–8420 1 Washer–Lock
29 95–4182 1 Nut – HH Jam
30 98–1459 1 Decal
31 3256–22 2 Washer–Flat
32 614249 2 Strap–Tie
7
3328–748
28
28
1
2
11
4
4
10
5
28
28
8
7
9
25
24
23
2X 22
21
20:2
20
27
20:2:2
20:2:2:1
20:2:1
20:1
12
2X 22
19
14
3
12
14
15
16
17
13
18
18
Sheet No.:14
Tie Rod, Spindle & Front Axle Assembly
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 3296–39 2 Nut–Lock, NI
2 94–2205–03 1 Pin–Pivot
3 3220–5 2 Nut–Jam
4 94–7539 2 Balljoint – LH Thread
5 100–1121 2 Rod–Tie
7 3296–29 2 Nut–Lock, NI
8 94–2197 1 Arm – Steering LH
9 322–32 2 Screw–HH
10 94–2196 1 Arm – Steering RH
11 3220–12 2 Nut–HJ, LH Thread
12 98–8086 2 Balljoint – RH Thread
13 94–7537–03 1 Spindle–LH
14 9548 2 Washer–Thrust
15 3296–61 1 Nut–Lock
16 302–5 1 Fitting–Grease
17 94–7568–03 1 Axle–Front
18 302–5 2 Fitting–Grease
19 94–7536–03 1 Spindle–RH
20 99–3695 2 Wheel & Tire ASM
20:1 99–3696 1 Tire
20:2 94–7541 1 Rim ASM
20:2:1 5108 1 Valve
20:2:2 94–7538 2 Bearing
20:2:2:1 94–2053 1 Ring–Snap
* 112819 1 Tube–Inner
21 95–4060 2 Washer – Wheel
22 9202514 4 Washer
23 9202524 2 Washer
24 3272–18 2 Pin–Cotter
25 94–7871 2 Cap–Dust
27 3231–25 2 Screw–CARR
28 98–8089 4 Nut–Lock
* Not illustrated
8
3328–748
35
32
10
9
8
7
6
5
4
3
2
1
38
37
36
33
34
32
31
11
12
13
30
14
29
16
15
17
12
25
26
18
23
24
16
2019
21
22
Hydro Transaxle Assembly
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 79–3340 2 Axle–Rear
2 79–3370 2 Key
3 911423 4 Bolt–Hex
4 107374 4 Washer
5 111196 2 End Cap–Differential
6 101889 2 Gear–Axle Differential
7 105876 2 Ring–Snap
8 101623 8 Gear–Pinion 11t
9 105061 1 Gear–Differential Ring
43t
10 108881 4 Nut
11 1540 1 Bearing–Needle
12 94–2021 2 Bearing – Needle
13 99–5334 1 Gasket–Case
14 111199 2 Bearing–Ball
15 1529 1 Bearing–Needle
16 108363 2 Pin–Locating
17 106826 2 Washer–Thrust
18 3243–5 4 Screw–Set
19 3218–3 4 Nut–Jam
20 105763–03 2 Hub–Wheel
21 6449 2 Seal–Oil
22 9416 2 Bearing
23 94–2001–03 1 Case–LH, Trans
24 99–8551 1 Plug–Pipe
25 94–2008 1 Gear – Sliding
27
28
26 94–2007 1 Shaft – Brake
27 94–2006 1 Gear ASM
28 9547 1 Washer–Thrust
29 94–2002–03 1 Case–RH, Trans
30 94–2019–03 1 Arm–Brake Pivot
31 100309 1 Cam–Spacer
32 3235–22 2 Screw–HH Lock
33 3272–6 2 Pin–Cotter
34 3256–24 2 Washer–Flat
35 94–2419 1 Band – Brake
36 2844 1 Washer
37 94–2009 1 Drum – Brake
38 253–44 1 Seal–Oil
Sheet No.:15
9
3328–748
10
9
8
5
7
6
30
30
35
34
33
32
31
5
4
3
2
1
36
37
F
L
28
23:1
23
11
12
13
16:1
15
38
29
25
2730
26
24
22
1614
18:1
21
16:2
18
19
39:1
20
17
18:2
39
40:1
Sheet No.:16
40
39:2
40:2
Hydro Trans Axle Assembly (cont.)
DescriptionPart No. Qty.Ref. No. DescriptionPart No. Qty.Ref. No.
1 1529 2 Bearing–Needle
2 94–2014 1 Tube – Shifter Rail
3 94–2054 1 Rail – Shift
4 94–2015 1 Fork – Hi/Lo Shift
5 933154 2 Pin–Roll
6 94–2143 1 Arm–Shifter
7 94–7510 1 Shift – Hi/Lo
8 3517 1 Ball–Detent
9 94–2024 1 Spring – Shift Detent
10 3247–2 1 Screw–Set, HS
11 94–7680–03 1 Dipstick
12 94–7559 1 Tube – Dipstick
13 32120–64 1 Ring–Snap, External
14 94–7565 1 Pinion – Bevel
15 702062 1 Gasket–Trans
16 94–7693 1 Fitting 90
16:1 237–42 1 O–Ring
16:2 237–30 1 O–Ring
17 94–7969 1 Tube – Hydraulic
18 94–7694 1 Fitting–Straight
18:1 237–42 1 O–Ring
18:2 237–30 1 O–Ring
19 94–2148–03 1 Plate–Support Bracket
20 323–13 4 Screw–HH
21 2412–141 2 Clamp–Drive, Worm
22 95–4133 1 Hose – Suction
23 94–7692 1 Fitting – Hose
23:1 237–80 1 O–Ring
24 94–2003 1 Transmission – Hydro
25 99–8551 1 Plug–Pipe
26 108323 1 Base–Filter
27 5991 1 Fitting
28 98–3596 1 Ass’y–Oil Filter
29 321–5 2 Screw–HH
30 1535 3 Washer–Thrust
31 8571 1 Bearing–Thrust
32 94–7566 1 Gear – Bevel
33 94–2010 1 Shaft – Input
34 32151–29 2 Ring–Retaining
35 94–2011 1 Gear – Hi/Lo
36 323–9 3 Screw–HH
37 323–8 2 Screw–HH
38 3253–3 2 Washer–Lock
39 95–4138 1 Fitting–HYD. Straight
39:1 237–22 1 O–Ring
39:2 237–42 1 O–Ring
40 95–4135 1 Fitting – Hydraulic 45
40:1 237–42 1 O–Ring
40:2 237–22 1 O–Ring
10
30
31
56
5
4X 33
Hydro Transmission No. 94–2003
1
2
3
4
5
6
7
8
9
34
35
15
58
16
17
18
19
36
20
21
22
23
24
25
26
3328–748
10
11
12
13
14
37
27
28
45
40
41
44 41
46 47
43
48 49
57
55
29
50
2X 33
3
52
53
Sheet No.:A1
11
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