Caterpillar Hydraulic System Manual (EN)

KENR7846 COMPONENT LOCATIONS June 2007 FLUID POWER SYMBOLS 330C MHPU Excavator Hydraulic System MSL1-UP © 2007 Caterpillar All Rights Reserved Printed in U.S.A. Hydraulic Symbols (Electrical) Electrical Symbols Table G M Transducer Transducer Generator Electric Motor (Fluid) (Gas / Air) 24 Page, (Dimensions:

34 inches x 28 inches) Electrical Wire Pressure Switch Pressure Switch (Adjustable) Temperature Switch KENR7846 Electrical Symbols (Electrical) T Pressure Symbol Temperature Symbol Level Symbol Flow Symbol Wire Number Identification Codes Electrical Schematic Example Hydraulic Schematic Example Current Standard Current Standard Harness identification code This example indicates wire 135 in harness "AG".

Wire Wire Color Circuit Number Identification 325-AG135 PK-14 325-PK Circuit Identification Number Wire Color Wire Gauge Previous Standard Wire Wire Color 325-PK-14 Circuit Number Identification Wire Gauge B A (EXAMPLE VALVE) F E D C B A G K J I H M L N P O Q (A) Straight travel solenoid valve (B) Right travel control valve (C) Attachment control valve (D) Bucket control valve (variable gauge undercarriage) (E) Boom 1 control valve (F) Stick II control valve (G) Straight travel control valve (H) Boom II control valve (I) Stick I control valve (J) Swing control valve (K) Left travel control valve (L) Line relief valve (boom cylinder rod end) (M) Line relief valve (stick cylinder head end) (N) Main relief valve (O) Line relief valve (bucket cylinder rod end) (P) Right body (Q) Left body MAIN CONTROL VALVE BASIC COMPONENT SYMBOLS MAIN AUX.

PUMP:

VARIABLE and PUMP or MOTOR FLUID CONDITIONER SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION 2-SECTION PUMP PRESSURE COMPENSATED (FIXED) VARIABILITY SPRING LINE RESTRICTION PRESSURE HYDRAULIC PNEUMATIC LINE RESTRICTION ATTACHMENT (ADJUSTABLE) (VARIABLE) COMPENSATION ENERGY TRIANGLES VARIA CB OL ME P a En Nd SP AR TE ES DSURE VALVES VALVE ENVELOPES VALVE PORTS ONE POSITION TWO POSITION THREE POSITION TWO-WAY THREE-WAY FOUR-WAY CONTROL VALVES A B A B P T P T NORMAL POSITION SHIFTED POSITION INFINITE POSITION CHECK VALVES BASIC SPRING SHUTTLE PILOT SYMBOL LOADED CONTROLLED FLUID STORAGE RESERVOIRS VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL MEASUREMENT PRESSURE TEMPERATURE FLOW ROTATING SHAFTS UNIDIRECTIONAL BIDIRECTIONAL COMBINATION CONTROLS SOLENOID SOLENOID SOLENOID SOLENOID and SERVO THERMAL DETENT or MANUAL and PILOT PILOT or MANUAL MANUAL CONTROL SYMBOLS PUSH-PULL LEVER MANUAL SHUTOFF GENERAL MANUAL PUSH BUTTON PEDAL SPRING PILOT CONTROL SYMBOLS RELEASED PRESSURE REMOTE SUPPLY PRESSURE EXTERNAL RETURN INTERNAL RETURN SIMPLIFIED COMPLETE INTERNAL SUPPLY PRESSURE ACCUMULATORS SPRING LOADED GAS CHARGED CROSSING AND JOINING LINES HYDRAULIC PUMPS FIXED VARIABLE DISPLACEMENT DISPLACEMENT NON-COMPENSATED UNIDIRECTIONAL BIDIRECTIONAL HYDRAULIC MOTORS Description Part Number Machine Location Schematic Location CYLINDER GP - VAR GAUGE UNDERCARRIAGE 233-8502 1 E-1, E-2, F-1, F-2 FILTER GP - CASE DRAIN 126-2075 2 A-4 FILTER GP - HYD (PILOT) 158-8987 3 A-4 FILTER GP - RETURN 188-4140 4 A-6 MANIFOLD GP - CONTROL 215-5037 5 B-5, B-6 MOTOR GP -FAN 191-5611 6 A-7 MOTOR GP -SWING 200-3373 7 E-7 MOTOR GP -TRAVEL PUMP GP - FAN 9Q-5697 194-8384 8 9 E-4, E-5 B-3 PUMP GP - MAIN SCREEN GP 250-2564 188-4067 10 11 B-3 A-4 SWIVEL GP 166-3088 12 E-5 VALVE GP - CHECK 190-7745 13 B-7 VALVE GP - CUSHION CROSSOVER RELIEF 158-9085 14 E-7 VALVE GP - FAN DRIVE PUMP RELIEF 200-3312 15 B-4 VALVE GP - MAIN CONTROL 258-0290 16 C-3 thru C-6 VALVE GP - PILOT 158-8250 17 D-8 VALVE GP - PILOT (LEFT UNIT) 216-6750 18 C-8 VALVE GP - PILOT (RIGHT UNIT) 216-6751 19 C-8 VALVE GP - PRESSURE REDUCING 232-4102 20 B-4 VALVE GP - SHUTTLE 185-0462 21 C-8 VALVE GP - TRACTION CONTROL 244-6346 22 E-4, E-5 10 JJ HH GG MAIN PUMP Tap Locations Pressure, Sampling, and Sensor Tap Number Description Schematic Location AA PILOT FILTER PRESSURE TAP A-5 BB LEFT TRAVEL MOTOR (M) PRESSURE GAUGE F-7 CC LEFT TRAVEL MOTOR (M1 ) PRESSURE GAUGE F-6 DD RIGHT TRAVEL MOTOR (M1) PRESSURE GAUGE F-6 EE RIGHT TRAVEL MOTOR (M) PRESSURE GAUGE F-5 FF FAN RELIEF VALVE PRESSURE TAP B-4 GG DRIVE PUMP DELIVERY PRESSURE TAP B-2 HH IDLE PUMP DELIVERY PRESSURE TAP A-2 JJ POWER SHIFT PRESSURE TAP A-2 SOS PILOT FILTER SAMPLING TAP A-5 2 3 4 11 10 9 15 14 1 12 5 16 20 8 22 19 17 21 18 7 6 13 18 19 7 6 5 16 20 2 3 4 11 14 10 21 9 17 15 13 12 8 1 22 MACHINE COMPONENT LOCATIONS CYLINDER GP 233-8502 1 VALVE GP 22 TRACTION CONTROL 244-6346 8 MOTOR GP TRAVEL 9Q-5697 1 CYLINDER GP 233-8502 INTERNAL VIEW VARIABLE GAUGE UNDERCARRIAGE W 5 (W) Swing parking brake (solenoid valve) (5) Control Manifold CONTROL MANIFOLD SOS 41 23 32 (4) Return Filter (3) Pilot Filter AA (2) Case Drain Filter FILTERS FF 9 15 (9) Fan Pump (FF) Pressure tap (15) Relief valve (fan pump) FAN PUMP

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1 8 F F MOTOR GP PISTON (TRAVEL) 9Q-5697 CYLINDER GP VAR GAUGE UNDERCARRIAGE 233-8502 EXPAND CYLINDERS MOTOR GP PISTON (TRAVEL) 9Q-5697 TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT) SWING MOTOR PG DB MOTOR GP SWING 200-3373 CC DD CYLINDER GP VAR GAUGE UNDERCARRIAGE 233-8502 C1 C EE VALVE GP CUSHION CROSSOVER RELIEF (ANTI-REACTION) 158-9085 M M1 M1 M E E DR1 DR1 DR A B BR CYLINDER GP VAR GAUGE UNDERCARRIAGE 233-8502 V1 V1 V V BR1 BR1 VALVE GP TRACTION CONTROL 244-6346 VALVE GP TRACTION CONTROL 244-6346 VARIABLE GAUGE UNDERCARRIAGE VALVE GP PILOT 158-8250 TRAVEL(R) TRAVEL(L) D D VALVE GP MAIN CONTROL 258-0290 VALVE GP PILOT (LEFT UNIT) 216-6750 VALVE GP PILOT (RIGHT UNIT) 216-6751 24 Page, (Dimensions:

34 inches x 28 inches) VARIABLE GAUGE UC BOOM KENR7846 C C B VALVE GP SHUTTLE 185-0462 B LINE PATTERNS FAN A A 126-2075 1 8 7 6 5 4 3 2 C C1 BL1 aL1 Di4 Pi4 aR1 BR3 AR3 aR BR5 4 Pi1 AR4 BR4 R1 AR5 aR5 aL3 BL2 AL2 T aL4 BL3 R2 AL3 AL4 IN RAISE BOOM STICK SWING LOWER OUT (2) (1) HL bL4 Di2 Pi2 bL3 Pi3 Di3 AL2 BL1 T aL4 BL3 R2 AL3 AL4 RAISE BOOM STICK LOWER (2) (1) HL bL4 Di2 Pi2 BR2 AR2 BR1 AR1aR2 aR3 BR3 BR1 aL1 Di4 BR1 aR5 T AL4 aL4 BL3 R2 AL3 RAISE IN aL2 LEFT AL1 REVERSE REVERSE STRAIGHT TRAVEL CONTROL VALVE CHECK VALVES MAIN RELIEF VALVE CLOSE LOWER IN BOOM (2) STICK (1) OUT SWING TRAVEL RIGHT (L) OUT STICK (2) STRAIGHT TRAVEL FORWAR TRAVEL (R) ATCH OPEN VARIABLE GAUGE UNDERCARRIAGE RAISE BOOM (1) HL Di2 Pi2 bL3 Pi3 Di3 bL2 bL1 DS D T PL PR D PR bR1 bR2 bR3 bR4 Di1 2 B1 P2 Pi1 Pi NO.1 N 2 PSA1 O2.

X2 NEGATIVE FLOW CONTROL PRESSURE PILOT PUMP M2 DRIVE PUMP IDLE PUMP M1 M3 NEGATIVE FLOW CONTROL PRESSURE (TRAVEL) (S P (TRAVEL) (S P WING (LOCK) ARKING) X2 PILOT PUMP M2 X3 M1 5 DR6 TOU T IN M3 OUT IN R L DOWN UP aR3 bR3 aR4 bR4 A2 A3 A4 A A 5 A6 A7 C B LINES GROUP COLOR DESCRIPTIONS DRIVE PUMP & LEFT TRAVEL PUMP OUTPUT PILOT PUMP OUTPUT HYDRAULIC OIL COOLING PUMP OUTPUT IDLE PUMP & RIGHT TRAVEL PUMP OUTPUT TRAVEL SPEED CONTROL CIRCUIT SUPPLY LINE DRAIN / RETURN LINE STEERING CIRCUIT ATTACHMENT CONTROL CIRCUIT PART OF A PRESSURE REDUCING PILOT CONTROL CIRCUIT RIGHT TRAVEL CONTROL & RIGHT TRAVEL MOTOR CIRCUIT LEFT TRAVEL CONTROL & LEFT TRAVEL MOTOR CIRCUIT SWING CONTROL & SWING MOTOR CIRCUIT CONTROL & CYLINDER CIRCUIT VARIABLE GAUGE UNDERCARRIAGE CONTROL & CYLINDER CIRCUIT CONTROL & CYLINDER CIRCUIT SHUTTLE VALVE SENSING CIRCUIT Pressure Line Pilot / Load Sensing Pressure Drain / Return Lines Component Group Attachment Air Line CALLOUTS YY Taps (Pressure, Sampling,Sensor) by letter 52 Components by number THIS SCHEMATIC IS FOR THE 330C PART #:

190-7786 HE CHG 09 (HYDRAULIC SCHEMATIC) PART #: 244-6370 - CHG 01 (LOWER - VARIABLE GAUGE) Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations OUT 7 6 5 4 3 2

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