874911 Volvo.Penta Pressure gauge, freshwater

Introduction
This Special Instruction will explain the rework for field installation of a new wiring harness for the radiator that is used on the radiator for the rear engine on certain 657G Wheel Tractor-Scrapers. The rework procedure and the new harness incorporate a solution for the rear surge in the engine that is caused by the back up alarm that is connected to a production harness. Do not perform any procedure that is outlined in this publication or do not order parts until the information that is contained in this document is understood.Required Parts
Table 1
Item     Qty     Part Number     Description    
1     1     313-7454     Wiring Harness (JUMPER)    
2     1     3E-5239     Relay As    
3     1     4M-5281     Bolt    
4     2     8T-4205     Hard Washer    
5     1     6V-8185     Nut    
6     5     7K-1181     Tie Strap    
7     1     9X-3401     Connector Pin    Machine Preparation
Move the machine to a safe area and secure the machine.
Lower the bowl to the ground.
Set the brakes.
Shut of the master disconnect switches for the tractor and the scraper.Rework Procedure
Illustration 1 g02138895
(8) Panel (A) Hole diameter 7.5 mm (0.30 inch) (B) 230 mm (9.1 inch) from the right edge (C) 90 mm (3.5 inch) from the top edge
Determine the location for hole (A) by using the dimensions in callouts (B) and (C). This hole will be used to mount the 3E-5239 Relay As (2) .
Drill a hole diameter 7.5 mm (0.30 inch) at location (C). Place a stop on the drill bit in order to limit the travel of the drill bit through the panel to 10 mm (0.4 inch). This will help to avoid damage to the components that are behind the panel (8) .Note: Orientation for the hole can be determined by standing behind the machine and facing toward the front of the machine.
Remove 4 bolts in order to gain access to the harness on the back of panel (8). Save the hardware.
Illustration 2 g02139393
(1) 313-7454 Wiring Harness Wiring (JUMPER) (9) Backup alarm 2-pin DT (10) 227-4986 Panel Harness As (11) Instrument panel lamp terminal (12) Instrument panel lamp switch 3-pin DT
Unplug the backup alarm 2-pin DT (9) from the 227-4986 Panel Harness As (10). Connect the existing 227-4986 Panel Harness As (10) connector to 313-7454 Wiring Harness (JUMPER) (1) by using the 2-pin DT receptacle. Connect the 2-pin DT plug that is on the 313-7454 Wiring Harness (JUMPER) (1) to the backup alarm 2-pin DT (9) .
Unplug the 3-pin DT plug on the 227-4986 Panel Harness As (10) from the instrument panel lamp switch (12). Join the connector from the 227-4986 Panel Harness As (10) to the 313-7454 Wiring Harness (JUMPER) (1) 3-pin DT receptacle. Connect the 313-7454 Wiring Harness (JUMPER) (1) 3-pin DT plug to instrument panel lamp switch (12) .
Loosen the instrument panel lamp terminal (11) that has the 204-BK wire attached to it. Add the 204-BK wire that is on the 313-7454 Wiring Harness (JUMPER) (1) to the same terminal, and secure the wire.
Connect the 313-7454 Wiring Harness (JUMPER) (1) to 3E-5239 Relay As (2) .
Illustration 3 g02139317
(2) 3E-5239 Relay As (3) 4M-5281 Bolt (4) 8T-4205 Hard Washers (5) 6V-8185 Nut
Mount 3E-5239 Relay As (2). Secure the 3E-5239 Relay As (2) with a 4M-5281 Bolt (3), two 8T-4205 Hard Washer (4), and a 6V-8185 Nut (5) .
Illustration 4 g02139473
Secure the two harnesses together with 5 7K-1181 Tie Strap .
Reinstall the control panel with the hardware that was removed in step 3.
Illustration 5 g02139490
Remove the ground wire (14) for the 227-4986 Panel Harness As (10) from the inside radiator support panel that is by the fan.
Cut off the ring terminal and install a 9X-3401 Connector Pin (item 7) to the wire.
Insert the 9X-3401 Connector Pin into the pin number 2 slot (15) of the connector that is on 227-4986 Panel Harness As (10) .
Check for the proper operation of the back up alarm.
Return the machine to service.