Craftsman 28906 Specifications

Professional Shop ManualElectric Module28906,28980, 28981,28984NOTE: These materials are for use by trained technicians who are experienced in the ser

ELECTRICAL SYSTEMRMC module plug test (electric PTO)1. Disconnect the molded 8-pin plug from the RMCmodule. See Figure 7.5.,Looking at the plug head-o

CRAFTSMAN,,,Lack of continuity to ground would indicate:• A broken or disconnected wire leading tothe reverse safety switch• A switch that is not clos

ELECTRICALSYSTEMRMCmoduleplugtest(manualPTO)1. Disconnect the molded 8-pin plug from the RMCmodule. See Figure 7.7.,Looking at the plug head-on, it wi

CRAFTSMAN,,,Interpretation: If this ground path is not good,there will probably be other ground-relatedissues with the tractor: slow starter motor, sl

ELECTRICAL SYSTEMElectric PTO switchUnderstanding the electric PTO switchIn A-Com, power is supplied to the PTO switchfrom the A1 terminal of the igni

CRAFTSMANPTO switch (manual PTO)• The manual PTO switch is mounted on the rightside of the seat box section of the frame.See Figure 7.11.Figure 7.11Br

ELECTRICAL SYSTEMTo access the brake switch:,Remove the deck by following the stepsdescribed in Chapter 8: Cutting Decks and LiftShaft.,Squeeze the ta

CRAFTSMANPark brake switchThe park brake switch is only used on tractors that areequipped with a manual PTO. The park brake switch isa simple NO singl

ELECTRICAL SYSTEMHyrdostatic transmissionsTractors equipped with a hydrostatic transmission havethe reverse switch mounted on the transmission, nextto

CRAFTSMANStarter solenoidThe starter solenoid is mounted inside the seat boxsection of the frame. See Figure 7.21.Figure 7.21Lighting circuitThe light

Table of ContentsIntroduction ... 1Professional Sh

ELECTRICAL SYSTEMFuseThe 20A fuse is located inside the seat box section ofthe frame, on the left side near the deck lift shaft.See Figure 7.24.Figure

CRAFTSMANElectronicsThe outdoor power equipment has historically had rela-tively simple electro-mechanical controls. Customerexpectations and regulato

ELECTRICAL SYSTEMElectrical environment: AC Vs. DCMost modern outdoor power equipment that has anelectrical system complex enough to require diagnosis

CRAFTSMAN. Kirchhoff's current law:Kirchhoff's current law deals with nodes. Nodesare the junction of two or more wires or the junc-tion of

ELECTRICALSYSTEM7. How the system is wired togetherThe Rules: All circuits have some basic rules thatmust be followed:7a. All circuits must have at le

CRAFTSMANSeries/parallel• Series/parallel circuits have some sections wiredin series and some in parallel. See Figure 7.30.BatteryLamp SwitchLampEarnF

ELECTRICALSYSTEMDigitalMulti-meterA DMM is the most useful tool to trouble-shootany electrical system. There is an amazing vari-ety of DMMs on the mar

CRAFTSMANWiringdiagramor schematicA wiring or a schematic diagram, and the abilityto read it are very important in troubleshooting acircuit. The diagr

ELECTRICALSYSTEMThere are two primary reasons to measureamperage:,To check the out-put of a charging systemor battery.,To check the performance of a c

CRAFTSMANTestingthechargingsystemQuick and dirty test: check voltage across the batteryposts using a DMM set to read D.C. voltage with theengine turne

CRAFTSMAN

ELECTRICALSYSTEM,2e.Interpretation: If the ohm meter indicatesno continuity between the two stator leads,there is a fault in the stator windings. If t

CRAFTSMAN,Some charging systems do not work if the sys-tem voltage falls below 6V. It takes a certainamount of voltage to excite the fields in the alt

ELECTRICALSYSTEMlb.10.ld.Give the battery at least ten minutes for theelectrolyte to stabilize after charging thebattery or adding water to the cells.

CRAFTSMANNOTE:CCA stands for cold cranking amps. Therating should be on the battery for aftermarketbatteries. For OEM batteries, contact the manu-fact

ELECTRICALSYSTEM3. Capacitance testingThere are several brands of capacitance battery testerspresently on the market. Capacitance battery testersuse t

CRAFTSMAN,,4e.4f.If the battery is being checked indepen-dently of the equipment it powers, mea-sure and note the battery voltage while it isdisconnec

ELECTRICALSYSTEM,7a.Starting with a fully charged battery and bat-tery cable connections that are clean andtight, measure the battery voltage.See Figu

CRAFTSMAN,,The voltage that shows-up on the meter is thevoltage that is being used to pass currentthrough a resistance in the circuit.Voltage drop on

ELECTRICALSYSTEM16.Voltage drop on a good circuit should be lessthan 0.1 volts. A voltage drop reading on themeter of greater than 0.2 volts indicates

CRAFTSMANThe male spade terminals that are associatedwith each-other face each-other broad-surfaceto broad surface. See Figure 7.52.Normally Closedswi

ELECTRICALSYSTEMINTRODUCTIONINTRODUCTIONThis module is divided into four sections:Section 1: About this module and precautionsSection 2: ComponentsThi

ELECTRICALSYSTEMTo test a relay:,,,,Test for continuity between the common and theNC terminals using a DMM.Test for continuity between the common and

CRAFTSMAN,,,Attach the negative lead of the DVOM to the sideof the diode with a band on it.Place the positive lead on the other side of thediode.There

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CRAFTSMANDescription of the GT seriesThis tractor platform introduced in the 2010 season..See Figure 1.1.Figure 1.1• New stronger frame• New hood and

ELECTRICALSYSTEMELECTRICAL SYSTEMCOMPONENTSRMC ModuleThe RMC module contains electronic logic circuits.When diagnosing anything that is connected to t

CRAFTSMAN,M is connected to the magneto by a yellow wire,G is connected to ground by a green wire, andA1 is connected to the after fire solenoid.NOTE:

ELECTRICAL SYSTEM,Symptom-After fire solenoid does not work:enqine starts and dies: The after fire solenoid ispowered directly by the red wire from th

CRAFTSMAN,When the RMC module is armed and turned-on: The tractor will operate identically to whenthe module is disarmed, except that the operatorwill