921e Tier 3 Schematic Hydraulic

20 15

19

YPP

6

5

18

P 7

8

3

4

PBR1

S3

S1

15A

2

1

X2

MX X

A1 19D

PBW

T

DS2

19A

B1 Ø 0.60

4A

X1

16

15B TP 6

T

15C

YPB Ø 1.20

BR3

4F

19C

YRC

P

4E

19B 15D

4D B 4B

Ø 2.2

BR1

15E

TP 10

9

A

T

N

A3

a2

PDB

22K

22K 4C

Ø 0.8

BR2

Ø 0.6

TP 11

TP 9

S2

LS

12

P

a1

PST

A1

B1

A2

B2

A3 B3 XX 29-40 BAR

Ø 1.2

21

22F 22G

TP 7

PBL

Ø 2.0

X

X MP

DS1 10

22A

Ø 0.8

Ø 2.0

22C

22

PBR2

22C

22C 29-40 BAR 290 BAR

11

221-223 22J BAR

22D T

22H

22B

S1 X

MT1 X 8 -11 BAR

38

38B

M2

40 39

33 CC

162 BAR

M1

22D

P

22D

X A1

b1

A2 Ø 0.8

234 BAR

TANK

M1

30

S2 X

B2 Ø 0.8

Ø 2.0

22K b3

24

30B EF

CF NOTE 2

30A

LS

TP 1

43

TP 3

31

X

L P

30D

T

G2

29

27

LS

SLS

ST

32

31B

29B

37cc

31C

29C

37

R

26

27A

PSS

30E

14cc

23

CF

YSS

29A

16cc

17.2cc

24B

LS

TP 2 G1

31A

33

24A

24C

30C

TP 5

16cc

T

Ø 0.31 240 BAR

Ø 0.31

27B

55bar

27C

3.45 bar

T

X

X

PHF

PRA

290 BAR

T

42A

44

XX

b2

38D

42B

Ø 2.0

22K

42

.3 +- 0.6 BAR

290 BAR 22E

234 BAR

IN

M2

22E

38A

NOTE 1

41

38C

290 BAR

P

25

36

PFA

28 11cc 45

45

35

5bar

34

5bar

47

46

34

1.FrontAxle Brakes Modulation pressure 78 to 85 BAR (1130 to 1235 PSI) 2.RearAxle Brakes Modulation pressure 80 to 87 BAR (1160 to 1260 PSI) 3.Parking Brake 4.Brake Valve 4A.Parking Brake Solenoid 4B.RearBrake Valve 4C.FrontBrake Valve 4D.AccumulatorIsolation CheckValve 4E.AccumulatorCharging Spool 4F.PriorityValve Cut-In Pressure 157 to 167 BAR (2277 to 2422 PSI) Cut-OffPressure 190 to 196 BAR (2755 to 2842 PSI)

CIRCUIT DIAGRAM LEGEND

54 SHOWS CIRCUIT CONNECTED

COMPONENT NUMBER

CHECK VALVE

RESTRICTOR

FILTER OR SCREEN

10.Brake LightSwitch ElectricalConnectorPBL 5 to 6 BAR (75 to 85 PSI)Increasing 11.FrontBrake Accumulator 3.5 Liter(3.69 Quart) 48 to 59 BAR (695 to 855 PSI)Precharge 12.RedundantAccumulatorPressure Switch ElectricalConnectorPRB2 55 to 69 BAR (800 to 1000 PSI)Decreasing 13.NotUsed 14.NotUsed 15.PilotControlValve 15A.PilotON/OFF Solenoid 15B.BucketPilotControl 15C.LiftPilotControl 15D.Auxiliary Hydraulics PilotControl1 15E.Auxiliary Hydraulics PilotControl2 16.BucketCylinderZ Bar

COMPONENTS 22D.Regeneration CheckValve 17.NotUsed 22E.CircuitReliefValve W /AntiCavitation 18.LiftCylinders 22F.PilotPressure Reducing Valve 19.Ride ControlValve 29 to 40 BAR (420 to 580 PSI) 19A.Ride ControlSolenoid 22G.PilotPressure Relief 19B.Ride ControlSpoolValve 22H.Load Sense SignalBleed Down Orifice 19C.ManualBleed Valve 22J.LoaderMain Relief 19D.Pressure ReliefValve 22K.Shuttle CheckValve 280 BAR (4060 PSI) 23.Steering Cylinders 20.Ride ControlAccumulators 24.Steering ControlValve 3.8 Liter(4 Quarts) 24A.Steering Spool 17 Bar(245 PSI)Precharge 24B.GeratorPump 21.PilotControlAccumulator 24C.CircuitReliefValve 0.75 Liter(0.79 Quarts) 25. Steering Back Pressure Valve 13 to 15 BAR (190 to 220 PSI)Precharge 8 to 10 BAR (115 to 145 PSI). 22.LoaderValve 26.Auxiliary Steering Pressure Switch 22A.Load Sense Shuttle Valve 27.Auxiliary Steering ControlValve 22B.Regeneration ReliefValve 27A.Auxiliary Steering Activation Solenoid 22C.Flow CompensatorSpool

27B.ReliefValve 27C.Priority Spool 28.Auxiliary Steering Pump 29.Pump 2 (Farthestfrom Transmission) 178LPM (47 GPM) CutOff280 BAR (4060 PSI) Delta 27 to 30 BAR (390 to 435 PSI) 29A.CompensatorDifferentialPressure Spool 29B.CompensatorHigh Pressure CutoffSpool 29C.ControlPiston W ith Spring 30.PriorityValve 30A.Priority SpoolRearPump 30B.Priority SpoolFrontPump 30C.DifferentialPressure Reliefs 28 to 31 BAR (375 to 420 PSI) 30D.Steering Relief 239 to 243 BAR (3465 to 3525 PSI) 30E.ReliefValve

31.Pump 1 (Closestto Transmission) 178 LPM (47 GPM) CutOff280 BAR (4060 PSI) Delta 28 to 31 BAR (405 to 450 PSI) 31A.CompensatorDifferentialPressure Spool 31B.CompensatorHigh Pressure CutoffSpool 31C.ControlPiston W ith Spring 32.Cooling Fan Pump 33.Brake Pump 34.100 Mesh Strainers 35.Reservoir 36.ReservoirVent 37.Filter10 Micron Media Bypass 3.4 BAR (49.3 PSI) W arning Switch 2.7 Bar(39 PSI) ElectricalConnectorFM 38.Fan Reversing and Variable Valve 38A.Fan CrossoverReliefs

38B.Reversing Spools 38C.Pulse W idth Modulation (PW M)ReliefSolenoid 38D.ON/OFF Reversing Solenoid 39.Standard Fan Valve 40.Cooling Fan 41.OilCooler 42.OilCoolerThermalValve 42A.PriorityValve 42B.ReliefValve 43.Axle CoolerPumps and Motor 44.Axle OilFilters Bypass 3.45 BAR (50 PSI) W arning Switch 2.75 Bar(40 PSI) ElectricalConnectorRearAxle PRA ElectricalConnectorFrontAxle PFA 45.Axle OilCoolers 46.RearAxle 47.FrontAxle

NOTES PUMP SUPPLY

SHOWS CIRCUIT CROSSING NOT CONNECTED

5.Parking Brake Accumulator 0.16 Liter(0.17 Quart) 95 to 98 BAR (1380 to 1420 PSI)Precharge 6.RearBrake Accumulator 2.8 Liter(2.95 Quart) 48 to 59 BAR (695 to 855 PSI)Precharge 7.RedundantAccumulatorPressure Switch ElectricalConnectorPRB1 55 to 69 BAR (800 to 1000 PSI)Decreasing 8.Low Brake Pressure W arning Switch ElectricalConnectorPBW Alarm OFF 106 to 115 BAR (1535 to 1670 PSI)Increasing 9.Brake Declutch Switch ElectricalConnectorPBD 10.3 BAR (150 PSI) ADJUSTABLE FROM 6.9 BAR (100 PSI) TO 27.5 BAR (400 PSI)

OIL COOLER

CIRCUIT

LOAD SENSE

COMPONENT

PILOT

NOTE 1.Check and reliefvalves notused with fan reverser. NOTE 2.Check valve formachines withoutauxiliary steering.

NOTE 3.Forpropertesting and adjustments ofhydraulic components see section 8002 in the RepairManual.

HYDRAULIC SCHEMATIC 921E WHEEL LOADER Additional copies of this Hydraulic and Electrical Schematic can be ordered through Technical Publications Distribution System. The part number is 5-5800

LINE TYPES Copyright © 2007. CNH America, LLC. All Rights Reserved.

BC07B502-00A