Fluid Power Graphic Symbols
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Fluid Power and Electrical Graphic Symbols
[SENR3981]
HYDRAULIC SYSTEM
Note: Use this module as a basic reference guide for graphic symbols. Do not use this module as a comprehensive reference guide.
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Illustration 1 | g01387054 |
(A) Pressure line
(B) Pilot/Load sensing pressure line (C) Drain/Return line (D) Component line (E) Attachment line (F) Air Line |
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Illustration 2 | g01345717 |
(G) One position
(H) Two-position (J) Three-position |
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Illustration 3 | g01345911 |
(K) Vented
(L) Pressurized (M) Return above fluid level (N) Return below fluid level |
Techniques For Crossing and Joining Lines
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Illustration 4 | g01819313 |
(P) Line crossing
(R) Lines joining |
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Illustration 5 | g01353004 |
(S) Two-way
(T) Three-way (U) Four way |
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Illustration 6 | g01353011 |
(V) Filter or strainer |
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Illustration 7 | g01386985 |
Separators (W) Manual drain (X) Automatic drain |
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Illustration 8 | g01386986 |
Filter separators (Y) Manual drain (Z) Automatic drain |
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Illustration 9 | g01819355 |
(AA) Pump or motor
(AB) Fluid conditioner (AC) Control valves (AD) Spring (AE) Restriction (AF) Line restriction (AG) Two-section pump (1) Main (2) Auxiliary (AH) Adjustable spring (AJ) Line restriction (variable) (AK) Variability |
Supplemental Component Symbols
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Illustration 10 | g01819393 |
Energy triangles (AL) Hydraulic (AM) Pneumatic |
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Illustration 11 | g01819413 |
Measurement (AN) Pressure (AP) Temperature (AR) Pressure tap (AS) Flow |
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Illustration 12 | g01819434 |
(AT) Unidirectional
(AU) Bidirectional |
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Illustration 13 | g01820233 |
Released pressure (AV) External return (AW) Internal return |
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Illustration 14 | g01820235 |
Remote supply pressure (AX) Simplified (AY) Complete (AZ) Internal pressure supply |
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Illustration 15 | g01820255 |
(BA) Push-pull lever
(BB) General manual (BC) Pedal (BD) Push button (BE) Spring (BF) Manual shutoff |
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Illustration 16 | g01353246 |
(BG) Spring loaded
(BH) Gas charged |
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Illustration 17 | g01820273 |
(BJ) Solenoid or manual
(BK) Solenoid and pilot (BL) Solenoid, pilot, or manual |
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Illustration 18 | g01629934 |
(CP) Connector (Mechanical Stop) |
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Illustration 19 | g01353280 |
(BM) Solenoid |
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Illustration 20 | g01820293 |
(BN) Servo
(BP) Thermal (BR) Detent |
Hydraulic, Pneumatic Cylinders
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Illustration 21 | g01353333 |
Single acting |
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Illustration 22 | g01387001 |
Double acting (BS) Single end rod (BT) Double end rod |
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Illustration 23 | g01820296 |
Fixed displacement (BU) Unidirectional (BV) Bidirectional |
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Illustration 24 | g01820298 |
Variable displacement (BW) Unidirectional (BX) Bidirectional simplified (BY) Bidirectional complete |
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Illustration 25 | g01820313 |
Fixed displacement (BZ) Unidirectional (CA) Bidirectional |
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Illustration 26 | g01820314 |
Variable displacement (CB) Unidirectional (CC) Bidirectional |
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Illustration 27 | g01820321 |
(CD) Basic symbols
(CE) Manual shutoff valve |
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Illustration 28 | g01353434 |
(CF) Basic symbol
(CG) Spring loaded |
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Illustration 29 | g01820338 |
(CH) Infinite position
(3) Flow in one direction (CJ) Two-position (4) Flow allowed in either direction (CK) Three-position (5) Parallel flow (6) Cross flow |
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Illustration 30 | g01358506 |
(7) Inlet (X psi)
(8) Outlet (Y psi) |
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Illustration 31 | g01820466 |
(CL) Normal position
(CM) Shifted position (CN) Infinite Position |
Simple Single Function Circuit
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Illustration 32 | g01358688 |
(9) (10) (11) |
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Illustration 33 | g01358901 |
(12) Three-position four-way open centered motor spool and pilot controlled directional controlled valve
(13) Combination crossover relief valve and makeup valve ( (14) Bidirectional motor (15) Main system relief valve (16) Pressure reducing pilot controlled valves (17) Check valve (18) Gas charged accumulator (19) Main pump motor ( (20) Pilot pump motor ( (21) Pilot filter and bypass valve (22) Pilot relief valve ( (23) Two positioned two-way pilot system disconnect valve (24) Tank |
Information System:
3500B Marine Propulsion Engines
Overhaul (Major)
TH55FT-E70 and TH55FT-E90 Petroleum Transmissions
Hydraulic Oil Contamination - Test
3606 and 3608 Engines
Finding the Top Center Position for the No. 1 Piston
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Engine Prelube
TH55FT-E70 and TH55FT-E90 Transmissions Power Train Electronic Control System
Electronic Control Module (ECM) - Configure
C13 and C15 On-Highway Engines
Fumes Disposal Filter Element - Replace - Open Crankcase Ventilation (OCV) Filter
TH48-E70-C27I, TH48-E70-C32I and TH48-E70-C32P Petroleum Power Train packages and TH48-E70 Petroleum Transmission Power Train Electronic Control System
MID 027 - CID 0190 - FMI 08
TH48-E70-C27I, TH48-E70-C32I and TH48-E70-C32P Petroleum Power Train packages and TH48-E70 Petroleum Transmission Power Train Electronic Control System
MID 027 - CID 0190 - FMI 02
C32 Marine Engine
Timing - Calibrate
C0.5 and C0.7 Industrial Engines
Overhaul Considerations
C4.4 and C6.6 Engines for Caterpillar Built Machines
Electrical Connectors - Inspect
TH48-E70-C27I, TH48-E70-C32I and TH48-E70-C32P Petroleum Power Train packages and TH48-E70 Petroleum Transmission Power Train Electronic Control System
MID 027 - CID 0444 - FMI 06
3606 and 3608 Engines
Camshaft Timing
CX35 On-Highway Transmission
Transmission Hydraulic Control
3512B and 3516B High Displacement Locomotive Engines
Engine Operation
Alternate Cleaning Procedure for Particulate Trap Exhaust Filters{1091}
Alternate Cleaning Procedure for Particulate Trap Exhaust Filters{1091}
2009/04/20
Ordering a Replacement Operator Protective Structure (OPS) Certification Film {7323, 7325, 7405, 7557}
3606 and 3608 Engines
Fuel Timing
TH55FT-E70 and TH55FT-E90 Petroleum Transmissions
Oil Filter (Transmission)
C13 and C15 On-highway Engines
Customer Device - Test
3606 and 3608 Engines
Fuel Injector Synchronization
C13 and C15 On-Highway Engines
ARD Nozzle - Clean - Engines Equipped with Purge Air Nozzles
3606 and 3608 Engines
Heinzmann Governor
3606 and 3608 Engines
Woodward EGB29P Governor