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Service Training August 1998
INTRODUCTION TO LOAD SENSING/PRESSURE COMPENSATED HYDRAULIC SYSTEMS
LOAD SENSING / PRESSURE COMPENSATION PUMP CONTROL VALVE
LOAD
ENGINE
VARIABLE DISPLACEMENT PUMP
DOUBLE CHECK VALVE
50 PSI SPRING
PRESSURE REDUCING VALVE
CLOSED CENTER CONTROL VALVE
INSTRUCTOR GUIDE
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COURSE DESCRIPTION Introduction to Load Sensing / Compensated Hydraulics Course Length: 1/2 Day Class size: 8 students maximum CONTENT
WHO SHOULD ATTEND: • Training Instructors • Technical Communicators • Product Support Engineers • Service Technicians This module of course explains a typical basic hydraulic system and builds it step-by-step into a Load Sensing / Pressure Compensated hydraulic system. Participants will learn about the advantages and disadvantages of a basic system versus a LS/PC system. A student handbook and quiz is provided to assist the students in learning the concepts of LS/PC. Students will be challenged to determine what happens as load and flow requirements change to the systems covered. This is a classroom based program and is normally taught as part of the hydraulic system training for a particular machine This module can stand a lone, but for better retention of the information refer to materials in the BCP Backhoe Loader Systems Course for various in the iron type exercises. COURSE PRE-REQUISITES Prerequisite tests should be administered at least one to two weeks before students take the course. Students should pass the following pretests with 90% or better. • Successfully passed the Basic ISO Pre-test VEBV0556 • Successfully passed the Basic Hydraulic Pretest VEBV0557 Prerequisite courses should be completed prior to participating in this course. • Multimedia Course "Fundamentals of Mobile Hydraulics" TECD9001
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PREPARATION CHECKLIST Prior to conducting the training session, gather the following materials: Service Training Meeting Guides STMG 595 "Introduction to Load Sensing Pressure Compensated Hydraulic Systems" SESV1595 Video Tapes "Introduction to LS/PC Hydraulics Systems"
SEVN1804
Miscellaneous - for Reference only "Introduction to LS/PC Hydraulics Systems" SEEV0540 "Introduction to Variable Displacement Pumps and Controls in LS/PC Hydraulics" SEEV0541 "Introduction to Pressure Compensated Valves in LS/PC Hydraulics" SEEV0542 "Introduction to 416-446 Backhoe Loader Hydraulics"SEEV0543 "Introduction to Variable Displacement Pumps and Controls in LS/PC Hydraulics" SEVN1837 "Introduction to Pressure Compensated Valves in LS/PC Hydraulics" SEVN1900 "Introduction to 416-446 Backhoe Loaders - LS/PC Hydraulics" SEVN1988
STUDENT LITERATURE CHECKLIST Description Form No. "Introduction to Load Sensing Pressure Compensated Hydraulic Systems" Student Handbook
MEDIA CHECKLIST SESV1595: 1-13 SESV1595: 14 & 15 are optional
MODULE: INTRODUCTION TO LOAD SENSING PRESSURE COMPENSATED HYDRAULICS This module is a review of basic "load sensing/pressure compensated" hydraulics.
OBJECTIVES
❑ ❑
1. On a quiz in the back of the Student Handbook, identify system characteristics of Load Sensing and Pressure Compensation and components used in this type of hydraulic system. 2. On a quiz in the back of the Student Handbook, determine system pressures and pressure differences at various locations on provided quiz schematics.
• LS/PC system review - These slides review the basic principles of load sensing and pressure compensation - Provide students with copies of the LS/PC Student Handout - The last three pages of the handout has a quiz, which the student must complete.
SHOW SLIDES: SESV1595: 1 - 13 Approx. Time: 2 hours
ADMINISTER QUIZ Approx. Time: 2 hours
• (Optional) LS/PC system review using a Video - The LS/PC Introduction Video may be used in place of the slides to complement the instructor's knowledge.
• Review Quiz
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LS/PC QUIZ ANSWERS
I. Match the following:
II. True/False.
1. A
A. F "closed"
2. E
B. T
3. D
C. T
4. B
D. T
5. C
E. F "double check valve"
III. Fill in the correct response. System pressure will be: 1800 psi + 300 psi = 2100 psi Valve A work port pressure = 1800 psi
∆ P across pressure reducing valve = 2100 psi - 1890 psi = ∆ P across control spool = 1890 psi -
1800 psi =
90
210
psi
1340
psi
psi
Valve B work port pressure = 700 psi
∆ P across pressure reducing valve = 2100 psi - 760 psi = ∆ P across control spool= 760 psi -
700 psi =
60
psi
IV. Fill in the correct response. System pressure will be:
3000
psi +
0
psi =
3000
psi
Valve A work port pressure = 3000 psi
∆ P across pressure reducing valve = 3000 psi - 3000 psi = ∆ P across control spool = 3000 psi - 3000 psi =
0
0
psi
psi
Valve B work port pressure = 1000 psi
∆ P across pressure reducing valve = 3000 psi ∆ P across control spool= 1060 psi -
