0336897 JOHNSON SCREW, Exh. hsg., long

General Information
Reference: For machine operation information, make reference to Operation & Maintenance Manual for the machine being serviced.Reference: For systems operation information of the hydraulic system, make reference to Hydraulic System Systems Operation module for the machine being serviced.Reference: For testing and adjusting information of the hydraulic system, make reference to the Hydraulic Systems Testing And Adjusting module for the machine being serviced.Reference: For electrical circuit schematics, make reference to the Electrical System Schematic module for the machine being serviced.Troubleshooting the electronic control system requires additional information from the machine Service Manual. The Electrical System Schematic, Parts Manual and the Operation & Maintenance Manual are required support material.As a guide, a typical system schematic is at the end of this manual. For an accurate representation of the machine being diagnosed, see the Electrical System Schematic in the machine Service Manual.When the troubleshooting procedure instructs to REPAIR THE HARNESS, use the Electrical System Schematic in the machine Service Manual to trace the circuit. Perform continuity checks at connectors to locate harness failures. At component connectors, always check the ground circuit. Less than five ohms of resistance is required between the connector ground contacts and frame ground. Excessive ground resistance, greater than five ohms, can cause incorrect diagnosing of problems.During troubleshooting, inspect all component and harness connections before any component is replaced. If these connections are not clean and tight they can cause electrical problems, either permanent or intermittent (come and go). Check that the wires are pushed into the connectors completely. Make sure the connections are tight before other tests are made.Failure of an electrical component can cause, or be caused by the failure of one or more other components. Always attempt to find and correct the cause of electrical system failure before making replacement of a component.Electrical Components And Connector Locations
The Electrical System Schematic, Parts Manual and the Operation & Maintenance Manual for the machine being serviced, should all be used to locate electrical components and connectors.The following is a guide to reading the Harness Connector and Component Location charts, the machine profile and the area views all found on the backside of the Electrical System Schematic module.* Component Location Chart: The component location chart uses white circles as location labels in the machine profile and area views. Alphabetical letters in the connector and machine location column indicate location in the area views.* Harness Connector Location Chart: The harness connector location charts use black circles as location labels in the general and area views. Alphabetical letters in the connector and machine location column indicate the area views where they are located. The "*" indicates that it is connected to the component in its harness and/or components column.Service Tools
The following service tools should be used to make troubleshooting the electrical system easier.6V-7070 Digital Multimeter or equivalent.8T-3224 Needle Tip Group.7X-1710 Cable Probe.8T-8726 Adapter Cable6V-2100 Multitach Group86-2727 Test Harness4C-4892 Fitting Group6V-3000 Repair Kit - Sure Seal4C-3406 Connector Repair Kit - Deutsch
Caterpillar Digital MultimeterUse the 6V-7070 Digital Multimeter or equivalent for making continuity (resistance) checks or voltage measurements. For instruction on use of the 6V-7070, see Special Instruction SEHS7734. The 7X-1710 Cable Probe is used to make measurements at connectors without disconnecting them. The probes are pushed in the back of the connector alongside the wire. The 8T-8726 Adapter Cable is a 3 pin breakout cable used to make measurements in sensor circuits. Use of continuity testers (such as 8T-0500), or voltage testers (such as 5P-7277) are not recommended for use on present-day Caterpillar electrical circuits, except for harness tests.Controller Connector Contact Numbers
Voltage Specifications
Troubleshooting Detected Faults
Every machine may not have all of the above error codes. For example: machines NOT equipped with PWM type temperature sensors will NOT have the error codes E26 and E28.
Monitor Panel Display Area
(1) Action alarm. (2) Fuel level gauge. (3) Character display. (4) Engine coolant temperature gauge. (5) Hydraulic oil temperature gauge. (6) Alternator alert indicator. (7) Engine coolant temperature alert indicator. (8) Hydraulic oil temperature alert indicator. (9) Engine oil pressure alert indicator. (10) Controller alert indicator. (11) Monitor alert indicator.When the electronic engine and pump control detects a fault while in normal mode, the controller and/or monitor alert indicators are turned ON. The Real Time Error function of Data Mode is used to show the detected faults. For detailed information on Data Mode, see the topic Service Operations in the Systems Operation section. The Error Log function of Calibration Mode is used to show detected faults that existed at some time during machine operation, but do not exist presently. The following troubleshooting procedures were written to help solve errors that are currently present. But the same procedures may be used to help determine the areas that may have caused the logged error. When a sensor fault is present, the corresponding alert indicator on the monitor panel is also activated. For example, if the coolant temperature sensor is shorted to +battery, then: a. The corresponding error code is stored in memory.b. The engine coolant temperature gauge shows in the problem region.c. The action lamp is FLASHING. Notice that the above items b and c are the same warning indications that are activated if the engine were to actually overheat.Troubleshooting Procedures
E1 - Engine Oil Pressure Is Too Low
This error code is present when the controller senses that the engine oil pressure is too low. With the engine running, ensure error code E1 is being shown on the monitor display.1. CHECK OIL PRESSURE - Use a 1U-5470 Engine Pressure Group to check the engine oil pressure. The engine must be running for this test.* Pressure is 50 kPa (7 psi) or more; oil pressure is correct. Go to Step 2.* Pressure is below 50 kPa (7 psi); oil pressure is not correct. Follow the checking procedures in the Engine Service Manual for the machine being serviced.2. CHECK HARNESS - Disconnect the oil pressure switch from the machine harness. Place a jumper wire from