Craftsman 917.378491 Owner's Manual

Rotary lawn mower 6.75 horsepower power-propelled 21" rear discharge

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Owner's Manual

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ROTARY LAWN MOWER

6.75 Horsepower

Power-Propelled

21" Rear Discharge

Model No.

917.378491

• EspaSol, p. 18

CAUTION:

Read and follow all

Safety Rules and Instructions

before operating this equipment

Sears, Roebuck and Co., Hoffman Estates, IL 60179

U.S.A.

Visit our Craftsman website: www.sears.com/craftsman

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Do you have a question about the 917.378491 and is the answer not in the manual?

Questions and answers

denewton8@yahoo.com

June 1, 2025

same as 378492 - drive belt size

1 comments:

Mr. Anderson

June 1, 2025

The drive belt for Craftsman part number 917.378491 is listed as part number 169778. Specific dimensions are not provided in the context.

This answer is automatically generated

Summary of Contents for Craftsman 917.378491

Page 1 6.75 Horsepower Power-Propelled 21" Rear Discharge Model No. 917.378491 • EspaSol, p. 18 CAUTION: Read and follow all Safety Rules and Instructions before operating this equipment Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A. Visit our Craftsman website: www.sears.com/craftsman...
Page 2 Warranty service is available by returning the Craftsman power mower to the nearest Sears Parts & Repair Center in the United States. This warranty applies only while this product is used in the United States.
Page 3 I. GENERAL OPERATION II. SLOPE OPERATION • Read, understand, and follow all Slopes are a major factor related to slip instructions on the machine and in the and fall accidents which can result in manual(s) before starting. Be thoroughly severe injury. All slopes require extra cau- familiar with the controls and the proper tion.
Page 4 Record both serial number and date of purchase in space provided above. Repair Protection Agreements Congratulations on making a smart pur- Fast help by phone - phone support chase. Your new Craftsman® product is from a Sears technician on products designed and manufactured for years of requiring in-home repair, plus conve- dependable operation.
Page 5 These accessories were available when this lawn mower was produced. They are not shipped with your mower. They are also available at most Sears retail outlets and service centers. Some of these accessories may not apply to your lawn mower. LAWN MOWER PERFORMANCE CLIPPING...
Page 6 Read these instructions and this manual in Operator presence its entirety before you attempt to assemble control bar or operate your new lawn mower. IMPORTANT: This lawn mower is shipped WITHOUT OIL OR GASOLINE in the engine. Your new lawn mower has been as- LIFT sembled at the factory with the excep- tion of those parts left unassembled...
Page 7 KNOW YOUR LAWN MOWER READ THIS OWNER'S MANUAL AND ALL SAFETY RULES BEFORE OPERATING YOUR LAWN MOWER. Compare the illustrations with your lawn mower to familiarize yourself with the location of various controls and adjustments. Save this manual for future reference. These symbols may appear on your lawn mower or in literature supplied with the product.
Page 8 1. Turn unit off and disconnect spark plug The operationof any lawn wire from spark plug. mowercan result in foreign 2. Rotate thumbscrew counter-clockwise objectsthrown into the to tighten the drive cable. eyes, which can result in 3. Operate mower to test drive speed. severeeye damage.Always 4.
Page 9 Pivot )ins Rear Grass ADD GASOLINE catcher • Fill fuel tank to bottom of tank filler neck. handle Do not overfill. Use fresh, clean, regular unleaded gasoline with a minimum of 87 octane. Do not mix oil with gasoline. Purchase fuel in quantities that can be used within 30 days to assure fuel fresh- Bess.
Page 10 NOTE: In cooler weatherit may be neces- MULCHING MOWING TIPS sary to repeatpriming steps.In warmer IMPORTANT: For best performance, weather over priming may causeflooding keep mower housing free of built-up and enginewill not start. If you do flood grass and trash. See "CLEANING" in the engine, wait a few minutesbeforeattempt- Maintenance...
Page 11 MAINTENANCE SCHEDULE /_:;,_°_o_y REGO RSERV,CE AS YOU COMPLETE Lubrication It#' CheckTires Check DriveWheels (Power-Propelled Mowers) Check for Loose Fasteners Clean/Inspect Grass Catcher (If Equipped) Clean Lawn Mower RE Clean Under Drive Cover (Power-Propelled Mowers) Check drive belt/pulleys (Power-Propelled Mowers) Check/Sharpen/Replace Blade Clean Battery/Recharge IElectdc Start MowersI Check Engine Oil Level...
Page 12 IMPORTANT: Blade bolt is heat treated. LAWN MOWER Always observe safety rules when per- If bolt needs replacing, replace only with approved bolt shown in the Repair Parts forming any maintenance. section of this manual. TIRES • Keep tires free of gasoline, oil, or insect Blade adapter Crankshaft control chemicals which can harm rubber.
Page 13 ENGINE 6. Stop adding oil when you reach the FULL mark on the dipstick. Wait a LUBRICATION minute to allow oil to settle. Use only high quality detergent oil rated with 7. Continue adding small amounts of oil, API service classification SF-SJ. Select the rechecking the dipstick until oil level oil's SAE viscosity grade according to your settles at FULL.
Page 14 CLEANING • Keep finished surfaces and wheels free IMPORTANT: For best performance, keep of all gasoline, oil, etc. mower housing free of built-grass and • We do not recommend using a garden trash. Clean the underside of your mower hose to clean lawn mower unless the after each use.
Page 15 or it may result in personal injury. If you believe that engine is running too fast or too slow, take your mower to a Sears or other qualified service center for repair and adjustment. CARBURETOR Your carburetor is not adjustable. If your engine does not operate properly due to sus- pected carburetor problems, take your lawn...
Page 16 ENGINE ENGINE Drain oil (with engine warm) and replace FUEL SYSTEM with clean engine oil. (See "ENGINE" in IMPORTANT: It is important to prevent the Maintenance section of this manual). gum deposits from forming in essential CYLINDER fuel system parts such as carburetor, fuel 1.
Page 17 TROUBLESHOOTING - See appropriate section in manual unless directed to a Sears Service Center. PROBLEM CAUSE CORRECTION Loss of power 1. Rear of mower housing or 1. Raise cutting height. blade dragging in grass. 2. Cutting too much grass. 2. Raise cutting height. 3.
Page 18 Contratapa GARANTfA LIMITADA DE DOS AI_IOS PARA LA SEGADORA A MOTOR CRAFTSMAN Per dos (2) ai_os, a partir de la fecha de compra, cuando esta Segadora Craftsman se mantenga, lubrique y afine segt]n las instrucciones para la operaci6n y el mantenimiento en el manual del dueiSo, Sears repararA gratis todo defecto en el material y la mano de obra.
Page 19 HACER: I. OPERAClON ° Antes de empezar, debe familiarizarse comple- ° Puede recortar a trav_s de la superficie de tamente con los controles y el uso correcto de la cuesta, nunca hacia arriba y hacia abajo. la maquina. Para esto, debe leer y comprender Proceda con extrema precauci6n cuando todas las instrucciones que aparecen en la ma- cambie de direcci6n en las cuestas.
Page 20 • Ayuda rapida por telefono - soporte tele- nuevo producto Craftsman® estA diseSado f6nico per parte de un t6cnico Sears sobre y fabricado para funcionar de modo fiable por productos que requieren un arreglo en casa, muchos aSos.
Page 21 Estos accesorios estaban disponibles cuando se produjo ta segadora. No son facilitados junto al cortacesped. Tambi6n estAn disponibles en la mayorfa de las tiendas de Sears yen los centros de servicio. Algunos de estos accesorios tal vez no se apliquen a su segadora. RENDIMIENTO DE LA SEGADORA DE RECORTES...
Page 22 Lea estas instrucciones y este manual comple- Barra de control c la presencia del operador tamente antes de tratar de montar u operar su Mango superior segadora nueva. IMPORTANTE: Este cortac_sped viene SIN ACEITE O GASOLINA en el motor. Mango Inferior Su segadora nueva ha side montada en la LEVANTAR f&brica con la excepci6n de aquellas partes que...
Page 23 FAMILIARICESE CON SU SEGADORA LEA ESTE MANUAL DEL DUENO Y LAS REGLAS DE SEGURIDAD ANTES DE OPARAR SU SEGADORA. Compare las ilustraciones con su segadora para familiarizarse con la ubicaci6n de los diversos controles y ajustes. Guarde este manual para referencia en el futuro. Estos simbolos pueden apareser sobre su segadora o en la literatura proporcionada con el producto.
Page 24 Si las condiciones no mejoran despu6s de los La operaci6n de cualquier pasos descritos (la velocidad hacia adelante segadora puede hacer que queda la misma), la correa de transmisi6n satten objetos extrafios dentro de estA desgastada y tiene que ser sustituida. sus ojos, Io que puede producir AMISO: Si el segadora comienza "a arrastrarse"...
Page 25 AGREGUE GASOLINA _Pasadordelc Mango del trasera bastidordel • Llene el estanque de combustible hasta recogedor la parte inferior del cuello de relleno del de c_sped estanque de gasolina. No Io Ilene demasiado. Use gasolina regular, sin plomo, nueva y lim- pia con el minimo de 87 octanos.
Page 26 2. Sujete la barradecontroles queexigen la CONSEJOS PARA SEGAR Y ACOL- presencia d eloperador a bajoenelmango CHAR y tireel mango delarrancador rapidamente. IMPORTANTE: Para obtener el mejor Nopermita queelcord6n arrancador se rendimiento mantenga la caja de la segadora devuelva a bruptamente. sin acumulacion de cesped y basura.
Page 27 PROQRAMA DE MANTENIMIENTO _-_'_ Lubricaci6n Controlar losneum_.ticos Controlar lasruedas motrices Revisar s ihaysujetadores sueltos (segadoras con poder propulsor) Limpiar/inspecoionar el recogedor de c_sped (siviene equipado) Limpiar l asegadora delacubierta d e latrans- misidn (segadoras conpoder p ropulsor) Limpiar debajo (segadoras sadas con poder propulsor) Revisar l ascorreas y laspoleas impul-...
Page 28 SEGADORA Ponga la cuchilla en el adaptador de 6sta alineando los dos (2) agujeros en la cuchilla Siempre observe las reglas de seguridad cu- con las satientes elevadas en el adaptador. ando haga el mantenimiento. Asegt_rese de que el borde de satida de LLANTAS la cuchilla (opuesto al borde afilado) est6 •...
Page 29 CAJA DE ENGRANAJES Limpie todo el aceite derramado en la sega- dora yen el lado det motor. • Para mantener el sistema de impulsi6n Echar aceite despacio en el conducto funcionando en forma adecuada, la caja de aceite, parAndose a intervatos regulares para engranajes y el Area alrededor de la impulsi6n controlar et nivet del aceite con la varilla.
Page 30 LIMPIEZA • Mantenga las superficies pulidas y las rue- das sin gasolina, aceite, etc. IMPORTANTE: Para obtener el mejor • No recomendamos el uso de una manguera rendimineto, mantenga ta caja de la segadora de jardfn para limpiar la segadora a menos sin acumulacion de cesped y basura.
Page 31 nando demasiado r#,pido o demasiado lento, Ileve su segadora amas con su centre de servicio Sears o con un otro centro de servicio cualificado. CARBURADOR Su carburador tiene un chorro principal fijo no ajustable para controlar la mezcla. Si su motor no est&...
Page 32 ACEITE DEL MOTOR MOTOR SISTEMA DE COMBUSTIBLE Drene el aceite (con el motor caliente) y c_mbielo con aceite de motor limpio. (Vea "MOTOR" en la IMPORTANTE: Es importante evitar que secci6n de Mantenimento de este manual.) se formen depositos de coma en partes fundamentales det sistemade combustible tales como el carburador, el filtro del combustible,...
Page 33 SOLUCION DE PROBLEMAS - Vea la secci6n apropiada en el manual amenos que estd dirigido a un centro de servico Sears. CORRECCI()N PROBLEMA CAUSA Falta de Eleve la attura de corte. 1. Cuchilla desgastada, doblada fuerza o suelta. Eleve la altura de corte. Altura de las ruedas dispareja.
Page 34 CRAFTSMAN ROTARY LAWN MOWER - - MODEL NUMBER 917.378491 36 _...
Page 35 CRAFTSMAN ROTARY LAWN MOWER - - MODEL NUMBER 917.378491 PART PART DESCRIPTION DESCRIPTION 186111 Upper Handle (Includes Grip) 175575X004 Axle Arm Assembly, LR 151721X479 Lower Handle 184193 Bolt 182815 Control Bar 150078 Thread Cutting Screw w!Sems 5/16-18 x 3/4 182755...
Page 36 CRAFTSMAN ROTARY LAWN MOWER - - MODEL NUMBER 917.378491 "* }-31...
Page 37 CRAFTSMAN ROTARY LAWN MOWER - - MODEL NUMBER 917.378491 PART PART DESCRIPTION DESCRIPTION 185685 Pawl Vari-Speed Drive Control Assembly 175098 169911 Retainer, Drive, LH Rearing, Wheel Adjuster 175105 175262 Pan Head Tapping Screw #10-24 x 2-3/4 175103 Pinion, Gear 185681...
Page 38 CRAFTSMAN ROTARY LAWN MOWER - - MODEL NUMBER 917.378491 GEAR CASE ASSEMBLY - - PART NUMBER 187212 PART DESCRIPTION 187525 Case, Lower 187526 Case, Upper 183499 Gear, 27 Teeth 187527 Shaft, Input 187528 Spacer 183505 Wire, Formed 183506 Bearing, Ball...
Page 39 BRIGGS & STRATTON 4-CYCLE ENGINE MODEL NUMBER 125K02-0273-E1 I 1019 LABEL KI'[] 52511 524 _:_ 718_ 27CJ...
Page 40 BRIGGS & STRATTON 4-CYCLE ENGINE MODEL NUMBER 125K02-0273-E1 443_ 163_ 977 CARBURETOR GASKET SET 276_ 127_ 276 _...
Page 41 BRIGGS & STRATTON 4-CYCLE ENGINE MODEL NUMBER 125K02-0273-E1 564V 332 _ 363_ 592_ 689 O 697_ 1036 EMISSIONS LABEL I...
Page 42 BRIGGS & STRATTON 4-CYCLE ENGINE MODEL NUMBER 125K02-0273-E1 358 ENGINE GASKET SET 20 _ 842_ PART PART DESCRIPTION DESCRIPTION 691866 Lock-Piston Pin 697322 Cylinder Assembly 499423 Pin-Piston 399269 Kit-Bushing/Seal 499424 299819 • Seal-Oil (Magneto Side) Rod-Connecting 691664 493279 Sump-Engine Screw (Connecting Rod) 695759 691160 Head-Cylinder...
Page 43 BRIGGS & STRATTON 4-CYCLE ENGINE MODEL NUMBER 125K02-0273-E1 PART PART DESCRIPTION DESCRIPTION 696565 Shaff-Throttle 95162 Clamp-Hose 698588 Cover-Control 691242 OPin-FIoat Hinge 497680 Starter-Rewind 498978 Jet-Main (Standard) 497466 Jet-Main (High Altitude) 691340 Screw (Muffler) 498260 Kit-Carburetor Overhaul 690340 Retainer-Governor Shaft 698801 Crank-Governor 498170 Carburetor...
Page 44 Your Home For repair - in your home - of all major brand appliances, lawn and garden equipment, or heating and cooling systems, no matter who made it, no matter who sold it! For the replacement parts, accessories owner's manuals that you need to do-it-yourself. For Sears professional installation of home appliances...