
18
TRACTOR - - MODEL NUMBER 917.273900
TUFF TORQ TRANSAXLE - MODEL NUMBER K46BA 448348
MODEL K46BA
7A646084101
33
16
20
10
34
34
35
19
13
90
95
34
76
80
81
84
87
86
8
9
15
7
82
78
82
85
83
ACTUAL PARTS
MAY NOT APPEAR
AS SHOWN
97
103
107
108
101
102
102
109
91
106
58
105
96
72
72
11
1
– – – –
Engine B&S Model No. 44N877-0039-G1
(589898401)(See engine breakdown.)
2 445962 Muffler
9
501832601
Keeper Belt Engine
12 586728901 Pulley
Engine
15 438080
Tank
Fuel
18 585124802 Cap
Fuel
20 421473X428
Control
Throttle/Choke
21
416358
Screw 10 x .750 BOS Thread
28 401135
Fuel
Line
29
137180
Spark Arrester Kit
37 123487X Clamp
Hose
42
539990247
Washer Lock 7/16
45
73510400
Nut Keps Hex 1/4-20 unc
62 434017
Shield
Heat
69 165391
Gasket
70
581881101
Exhaust Tube LH
71
581881001
Exhaust Tube RH
79
183906
Screw 5/16-18 x 1
81
148456
Tube Drain Oil
82
428287
Valve Oil Drain
84
17060620
Screw 3/8-16 x 1-1/4
85
501606501
Bolt Hex 7/16-20 x 4 x Gr. 5-1.5
90
17000616
Screw 3/8-16 x 1.0
91 187495
Bushing
102 17000512
Screw5/16-18 x 3/4
KEY PART
NO. NO.
DESCRIPTION
NOTE:
All component dimensions given in U.S. inches
1 inch = 25.4 mm
TRACTOR - - MODEL NUMBER 917.273900
ENGINE
Engine Power Rating Information
The gross power rating for individual gas engine models is labeled in accordance with SAE (Society of Automotive
Engineers) code J1940 (Small Engine Power & Torque Rating Procedure), and rating performance has been ob-
tained and corrected in accordance with SAE J1995 (Revision 2002-05). Torque values are derived at 3060 RPM;
horsepower values are derived at 3600 RPM. Actual gross engine power will be lower and is affected by, among
other things, ambient operating conditions and engine-to-engine variability. Given both the wide array of products
on which engines are placed and the variety of environmental issues applicable to operating the equipment, the
gas engine will not develop the rated gross power when used in a given piece of power equipment (actual “on-site”
or net power). This difference is due to a variety of factors including, but not limited to, accessories (air cleaner,
exhaust, charging, cooling, carburetor, fuel pump, etc.), application limitations, ambient operating conditions (tem-
perature, humidity, altitude), and engine-to-engine variability. Due to manufacturing and capacity limitations, Briggs
& Stratton may substitute an engine of higher rated power for this Series engine.