803821006 Mercury PARTS MANUAL, 25/25 Jet/30HP (2 Cyl/430cc) International

Illustration 1 g00683978
Block Diagram Of Inputs And Outputs Of The 312C, 315C, 318C, 319C, 320C, and 322C Controller (1) Engine and pump controller (2) Fuse Box (3) Engine (4) Governor lever (5) Hydraulic Pump (6) Battery (7) Start switch (8) Speed sensor (9) Backup switch (10) Governor actuator (11) Feedback sensor (12) Monitor (13) Action alarm (14) Engine speed dial (15) Switch panel (16) Engine coolant temperature sensor (17) Hydraulic oil temperature sensor (18) Fuel level sensor (19) Alternator (20) Engine oil pressure switch (21) One touch low idle switch (22) Engine oil level switch (23) Hydraulic oil level switch (24) Water separator level switch (25) Swing pressure switch for the implement (26) Travel pressure switch (left) (27) Travel pressure switch (right) (28) Pressure switch for the straight travel pedal (29) Pump pressure sensor (drive) (30) Pump pressure sensor (idle) (31) Proportional Reducing Valve (32) Solenoid for straight travel (33) Solenoid for travel speed (34) Solenoid valve for the swing parking brake (35) Travel alarm (36) Air heater indicator (37) Switch (Clogged air filter) (38) Switch (Clogged hydraulic oil filter) (39) Engine coolant level switch (40) Pressure switch for the attachment pump (41) Pressure switch for the attachment pedal (42) Pressure switch for the attachment pedal (2) (43) Proportional reducing valve for the auxiliary hydraulics (Attachment)
Illustration 2 g00986604
Diagram Of Inputs And Outputs Of The 321C Controller (1) Engine pump controller (2) Starter switch (3) Fuse box (4) Battery (5) Engine (6) Governor lever (7) Pump (8) Speed sensor (9) Feedback sensor (10) Governor actuator (11) Backup switch (12) Action alarm (13) Engine speed dial (15) Engine coolant temperature sensor (16) Hydraulic oil temperature sensor (17) Fuel level sensor (18) Alternator (19) Engine oil pressure switch (20) One touch low idle switch (21) Engine oil level switch (22) Hydraulic oil level switch (23) Implement/swing pressure switch (24) Travel pressure switch (Right) (25) Travel pressure switch (Left) (26) Pump delivery pressure sensor (Drive) (27) Pump delivery pressure sensor (Idle) (28) Monitor (29) Proportional reducing valve for power shift pressure (30) Straight travel solenoid valve (31) Travel speed solenoid valve (32) Swing parking brake solenoid valve (33) Travel alarm (34) Air heater controller (35) Clogged air filter switch (36) Clogged hydraulic oil filter switch (37) Engine coolant level switch (38) Attachment pump pressure switch (39) Attachment pedal pressure switch (1) (40) Proportional reducing valve for flow control pressure (41) Water separator level switch (43) Attachment pedal pressure switch (2) (44) Travel alarm cancel switch (45) Travel mode switch (46) AEC switch (47) 1 pump/2 pumps change solenoid valve
Illustration 3 g00823975
Diagram Of Inputs And Outputs Of The 325C and 330C Controller (1) Engine and Pump Controller (2) Starter Switch (3) Fuse Box (4) Battery (5) Engine (7) Pump (8) Speed sensor (10) Electronic Control Module (11) Backup Switch (12) Action Alarm (13) Engine Speed Dial (14) Switch Panel (16) Hydraulic Oil Temperature Sensor (17) Fuel Level Sensor (18) Alternator (20) One- touch Low Idle (21) Engine Oil Level Switch (22) Hydraulic Oil Level Switch (23) Implement Swing Pressure Switch (24) Travel Pressure Switch (right) (25) Travel Pressure Switch (left) (26) Pump Pressure Sensor (drive) (27) Pump Pressure Sensor (idle) (28) Monitor (29) Proportional Reducing Valve (30) Straight Travel Solenoid Valve (31) Travel Speed Solenoid Valve (32) Swing Parking Brake Solenoid Valve (33) Travel Alarm (35) Clogged Air Filter Switch (36) Clogged Hydraulic Oil Filter Switch (37) Engine Coolant Level Switch (38) Work tool pressure switch (39) Attachment Pedal Pressure Switch (40) Flow Control Valve (41) Water Separator Level Switch (42) Pressure switch for attachment (43) Attachment Pedal Pressure Switch
Illustration 4 g01090443
Diagram Of Inputs And Outputs Of The M325C MH Controller (1) Engine and Pump Controller (2) Starter Switch (3) Fuse Box (4) Battery (5) Engine (7) Pump (8) Speed sensor (10) Electronic Control Module (11) Backup Switch (12) Action Alarm (13) Engine Speed Dial (14) Switch Panel (16) Hydraulic Oil Temperature Sensor (17) Fuel Level Sensor (18) Alternator (20) One-touch Low Idle (21) Engine Oil Level Switch (22) Hydraulic Oil Level Switch (23) Implement Swing Pressure Switch (26) Pump Pressure Sensor (drive) (27) Pump Pressure Sensor (idle) (28) Monitor (29) Proportional Reducing Valve (32) Swing Parking Brake Solenoid Valve (35) Clogged Air Filter Switch (36) Clogged Hydraulic Oil Filter Switch (37) Engine Coolant Level Switch (38) Work tool pressure switch (39) Attachment Pedal Pressure Switch (40) Flow Control Valve (41) Water Separator Level Switch (42) Pressure switch for attachment (43) Attachment Pedal Pressure SwitchNote: The 312C has one travel pressure switch. The 315C has one travel pressure switch. The 318C and 321C have two travel pressure switches.Note: The Engine Control Module is on the 325C and on the 330C.The controller is connected to the machine through two 54-pin connectors. The controller monitors the system through the inputs. Then, the controller adjustments the system through the outputs. The controller will control the hydraulic output of the pump by adjusting the power shift pressure according to the load on the machine.
Illustration 5 g00778730
Engine and Pump Controller (ECM) (44) Controller (45) Connector 1 (46) Connector 2
Table 1
Engine And Hydraulic Pump Control (Connector 1) (1)    
No. 1    Function    Type    
1     +Unswitched Battery     Power    
2     Ground     Ground    
4     Air Heater Relay     Solenoid Output    
7     Pressure Switch for 319C, 320C, and 320C LRR     Switch Input    
8     Hammer Switch for 319C, 320C, and 320C LRR     Switch Input    
9     Engine Speed Dial 1     Operational Switch Input    
10     Engine Speed Dial 2     Operational Switch Input    
11