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ENGINE
TRACTOR - - MODEL NUMBER LTH18538 (289600)
KEY PART
NO. NO. DESCRIPTION
1 Engine Bnggs Model No.
31N707-1374-B1
2 532 13 73-52 Muffler
9 532 19 43-20 Keeper Belt Engine
12 532 40 54-71 Pulley Engine
15 532 40 75-45 Tank Fuel
18 532 43 02-20 Cap Fuel
20 532 18 38-97 Control Throttle/Choke
21 532 41 83-58 Screw #10 x 0.750 BOS Thread
28 532 40 11-37 Fuel Line
29 532 13 71-80 Spark Arrester Kit
37 532 12 34-87 Clamp Hose
42 810 04 07-00 Washer Lock 7/18
45 873 51 04-00 Nut Keps Hex 1/4-20 unc
69 532 16 52-91 Gasket
79 532 19 23-34 Screw 5/16-18 x 3/4
84 817 06 06-20 Screw 3/8-16 x 1/4
85 532 17 39-37 Bolt Hex 7/16-20 x 4 Gr. 5
90 8170006-18 Screw 3/8-16xl
98 819 09 14-18 Washer 9/32 x 7/8 x 18 Ga.
97 817 67 04-12 Screw 1/4-20 x 3/4
122 532 42 19-22 Extension Drain Oil
NOTE: All component dimensions given in U.S. inches
1 inch = 25.4 mm
For engine service and replacement parts, call the toll free
number for your engine manufacturer listed below:
Briggs & Stratton 1-800-233-3723
Engine Power Rating Information
The gross power rating for individual gas engine models is labeled in accordance with SAE (Society of Automotive En-
gineers) code J1940 (Small Engine Power & Torque Rating Procedure), and rating performance has been obtained 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 operat-
ing 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 (temperature, 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.
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