IDLER GP-TRACK 1617549 - Caterpillar

Introduction
The specifications given in this book are on the basis of information available at the time the book was written. These specifications give the torques, operating pressure, measurements of new parts, adjustments and other items that will affect the service of the product.When the words "use again" are in the description, the specification given can be used to determine if a part can be used again. If the part is equal to or within the specification given, use the part again.When the word "permissible" is in the description, the specification given is the "maximum or minimum" tolerance permitted before adjustment, repair and/or new parts are needed.A comparison can be made between the measurements of a worn part, and the specifications of a new part to find the amount of wear. A part that is worn can be safe to use if an estimate of the remainder of its service life is good. If a short service life is expected, replace the part. The specifications given for "use again" and "permissible" are intended for guidance only and Caterpillar Tractor Co. hereby expressly denies and excludes any representation, warranty or implied warranty of the reuse of any component. This engine uses bolts (3/8 inch size only) with washer heads in some locations. The washer head bolt does not need a plain washer, lockwasher or lockplate. Where these bolts are used on aluminum covers or housings, a plain washer is needed. If you are not sure a washer is used under a bolt head, use the Parts Book to see if a washer is needed.Glossary
arcing:a discharge of electricity across a gapacceleration:rate at which speed increasesbus:an electrical conductorcompare:look at for differencescranking:rotation of the engine by the starter motorcircuit:connected electric componentsdeactivate:stop a functiondeceleration:rate at which speed decreasesde-energized:power offenergized:power onfailsafe:circuit that gives protectionhertz:cycles per secondhunt:speed changeshydra-mechanical:hydraulically controlled mechanical actioninversely:the opposite of directlyisochronous:desired engine speed does not change because of a change in loadjumper:electrical connectionkilowatt:measure of electric poweroverspeed:engine speed higher than rated speedoverride:cause normal electrical signals to be cancelednonparallel:singleparalleled:electrically connected together to drive a common loadparalleling:all positive poles are connected to one conducter and all negative poles are connected to another conductorproportion:a ratioproportional:two factors that have a constant ratiopotentiometer:electric component that has variable resistanceramp:circuit that controls movement from one level to anotherresponse:time and stability characteristic of a change in output sensing phasing:measurement and comparison of output with other units in the systemshort:any connection between two or more electrical components that is not desiredshielding:steel braid for protection of a wiresharing:two or more engines used to drive a common loadspeed droop:no load engine rpm minus full load rpmstandby:ready for use during an emergencytransfer:change from one to anotherWoodward PSG Governors
SCHEMATIC OF LATEST PSG GOVERNOR
1. Return spring. 2. Output shaft. 3. Output shaft lever. 4. Strut assembly. 5. Speeder spring. 6. Power piston. 7. Flyweights. 8. Needle valve. 9. Thrust bearing. 10. Pilot valve compensating land. 11. Buffer piston. 12. Pilot valve. 13. Pilot valve bushing. 14. Control ports. A. Chamber. B. Chamber.Introduction
The Woodward PSG (Pressure compensated Simple