Material Caterpillar 320b 330b Hydraulic Excavators Pilot System Components Diagrams Schematics 2a2m51
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Service Training MALAGA
320B/330B Hydraulic Excavators III. PILOT SYSTEM
The pilot system is very similar to the pilot system on the 300A with regard to components and operation.
Francis June 97
Page:
PILOT & LOGIC CONTROL SCHEMATIC
2
Pressure Switch (Implement/ AEC) Pressure Switch (Travel / AEC)
Straight Travel Valve
Boom 1
Bucket
Pilot Pump
320B - 330B HYDRAULIC EXCAVATORS
Pilot Control Valve (Joystick)
CHAPTER : Pilot System
Pilot Oil Manifold
Attachment
Right Travel
Left Travel
Swing
Stick 1
Pilot Relief Valve
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PILOT LOGIC CIRCUIT
Stk 2
Bm 1
Bkt
Rt Trav
Return age
Top Pump Inlet
Nfc Parallel ages
Page:
3
Str Trav
Atch
Bottom Pump Inlet
Lft Trav
Sw
Stk 1
Bm 2
Parallel ages
Nfc Return age
Page:
PILOT OIL MANIFOLD SCHEMATIC
4 To Logic Circuit
Return Oil
To Pump Regulator
To Stick Control Valve 2 From Stick Pilot Control Valve
LEVEL FINISH SOLENOID
121-1490
To Swing Brake TRAVEL SPEED SOLENOID
TRENCHING SOLENOID
PRESSURE REDUCING VALVE
121-1491
121-1490
111-9916
From Main Control Valve Group Pilot Pump
320B - 330B HYDRAULIC EXCAVATORS
Pilot Relieve valve
CHAPTER : Pilot System
To Hydr. Actuation Valve
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PILOT OIL MANIFOLD (Partial)
To swing brake To Logic Circuit Hyd. Activ. Control Valve
Accumulator
Pilot Relief Valve
Check Valve Pilot Pump
Page:
5
Page: 6
RIGHT TRAVEL CONTROL VALVE
Pressure swich (Implement / AEC) Orifice
320B - 330B HYDRAULIC EXCAVATORS
Pilot line
CHAPTER : Pilot System
Pressure switch (Travel / AEC)
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PROPORTIONAL REDUCING VALVE
SOLENOID
To Pump Suction Line
SIGNAL CURRANT INCREASE To Pump Regulator
a
(PS signal)
b Pilot Oil pump
To Pump Suction Line To Pump Regulator
SIGNAL CURRANT DECREASE
(PS signal)
Pilot Oil pump
Page:
7
a. Return age b. Inlet age
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PILOT CONTROL VALVE
300B 123-2147
From Main Control Valve 1 3
2
c
b
a
To Main Control Valve Pilot Pump
Pilot Pump To Main Control Valve
Pilot Pressure
4000 kPa
3000 kPa
800 kPa
300B Lever Stroke
Page:
8
1. 2. 3. a. b. c.
Rod Spring Spool Line to control valve Line from control valve Return age
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
SHOCK REDUCING VALVE (Check Valve Open)
Pilot Control Valve
Boom - 1
Shock Reducing Valve
E
Check Valve
a a. age
Page:
9
Pump Assembly
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
SHOCK REDUCING VALVE (Check Valve Closed)
Pilot Control Valve
Boom - 1
c Shock Reducing Valve
E
d b
b. Outlet Port c. age d. Orifice
Page:
10
Pump Assembly
320B/330B Hydraulic Excavators III. PILOT SYSTEM
The pilot system is very similar to the pilot system on the 300A with regard to components and operation.
Francis June 97
Page:
PILOT & LOGIC CONTROL SCHEMATIC
2
Pressure Switch (Implement/ AEC) Pressure Switch (Travel / AEC)
Straight Travel Valve
Boom 1
Bucket
Pilot Pump
320B - 330B HYDRAULIC EXCAVATORS
Pilot Control Valve (Joystick)
CHAPTER : Pilot System
Pilot Oil Manifold
Attachment
Right Travel
Left Travel
Swing
Stick 1
Pilot Relief Valve
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PILOT LOGIC CIRCUIT
Stk 2
Bm 1
Bkt
Rt Trav
Return age
Top Pump Inlet
Nfc Parallel ages
Page:
3
Str Trav
Atch
Bottom Pump Inlet
Lft Trav
Sw
Stk 1
Bm 2
Parallel ages
Nfc Return age
Page:
PILOT OIL MANIFOLD SCHEMATIC
4 To Logic Circuit
Return Oil
To Pump Regulator
To Stick Control Valve 2 From Stick Pilot Control Valve
LEVEL FINISH SOLENOID
121-1490
To Swing Brake TRAVEL SPEED SOLENOID
TRENCHING SOLENOID
PRESSURE REDUCING VALVE
121-1491
121-1490
111-9916
From Main Control Valve Group Pilot Pump
320B - 330B HYDRAULIC EXCAVATORS
Pilot Relieve valve
CHAPTER : Pilot System
To Hydr. Actuation Valve
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PILOT OIL MANIFOLD (Partial)
To swing brake To Logic Circuit Hyd. Activ. Control Valve
Accumulator
Pilot Relief Valve
Check Valve Pilot Pump
Page:
5
Page: 6
RIGHT TRAVEL CONTROL VALVE
Pressure swich (Implement / AEC) Orifice
320B - 330B HYDRAULIC EXCAVATORS
Pilot line
CHAPTER : Pilot System
Pressure switch (Travel / AEC)
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PROPORTIONAL REDUCING VALVE
SOLENOID
To Pump Suction Line
SIGNAL CURRANT INCREASE To Pump Regulator
a
(PS signal)
b Pilot Oil pump
To Pump Suction Line To Pump Regulator
SIGNAL CURRANT DECREASE
(PS signal)
Pilot Oil pump
Page:
7
a. Return age b. Inlet age
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
PILOT CONTROL VALVE
300B 123-2147
From Main Control Valve 1 3
2
c
b
a
To Main Control Valve Pilot Pump
Pilot Pump To Main Control Valve
Pilot Pressure
4000 kPa
3000 kPa
800 kPa
300B Lever Stroke
Page:
8
1. 2. 3. a. b. c.
Rod Spring Spool Line to control valve Line from control valve Return age
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
SHOCK REDUCING VALVE (Check Valve Open)
Pilot Control Valve
Boom - 1
Shock Reducing Valve
E
Check Valve
a a. age
Page:
9
Pump Assembly
320B - 330B HYDRAULIC EXCAVATORS CHAPTER : Pilot System
SHOCK REDUCING VALVE (Check Valve Closed)
Pilot Control Valve
Boom - 1
c Shock Reducing Valve
E
d b
b. Outlet Port c. age d. Orifice
Page:
10
Pump Assembly
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