- Excavator:
- 5110 (S/N: 7GN1-UP; 8HN1-UP; 80M1-UP)
- Load Haul Dump:
- R1300GSeries II (S/N: RSL1-UP; C6E1-UP)
- Off-Highway Truck/Tractor:
- 784C (S/N: 2PZ1-UP; 2BE1-UP; 8BR1-UP; 5RT1-UP)
- Track-Type Loader:
- 953C (S/N: BBX1-UP; BMA1-UP; 7LP1-UP)
- Underground Articulated Truck:
- AD30 (S/N: CXR1-UP; DXR1-UP; LHX1-UP)
- Underground Drill:
- UD245 (S/N: DCX1-UP)
- Wheel Loader:
- 980GSeries II (S/N: AXG1-UP; TCA1-UP; BET1-UP; 3JT1-UP; 1AY1-UP; 1WY1-UP; 7WY1-UP)
- 5110B (S/N: AAA1-UP; AAK1-UP; AAT1-UP)
- 5130 (S/N: 7TJ1-UP; 5ZL1-UP; 7YG1-UP)
- 5130B (S/N: 4CS1-UP; 2GR1-UP)
- 5230 (S/N: 7LL1-UP)
- 5230B (S/N: 4HZ1-UP)
- 5230 (S/N: 2PK1-UP)
- 5230B (S/N: 7TR1-UP)
- UNDERCARRIAGE (S/N: L5N1-UP)
- R1600 (S/N: 9XP1-UP; 9EW1-UP; 7ZR1-UP; 6MY1-UP)
- R1600G (S/N: 9PP1-UP; 9YZ1-UP)
- R1700G (S/N: SBR1-UP; 8XZ1-UP; RSX1-UP)
- R2900G (S/N: GLK1-UP; BKN1-UP)
- 785B (S/N: 6HK1-UP; 4WJ1-UP)
- 785C (S/N: 1HW1-UP; APX1-UP; 5AZ1-UP)
- 785D (S/N: MSY1-UP; B7F1-UP)
- 789B (S/N: 7EK1-UP; 1KT1-UP; 3LT1-UP)
- 789C (S/N: 2BW1-UP; 6LE1-UP; 8WM1-UP)
- 793B (S/N: 1HL1-UP; 1PT1-UP; 3KT1-UP)
- 793C (S/N: CBR1-UP; 4AR1-UP; ATY1-UP; 4GZ1-UP; 4GX1-UP)
- 793D (S/N: FDB1-UP; T5C1-UP; T6C1-UP; JGG1-UP; JXG1-UP)
- 793FSeries AC (S/N: EMD1-UP; SSP1-UP; B7B1-UP; B7C1-UP; PJT1-UP)
- 795F (S/N: ERM1-UP; JTL1-UP)
- 797B (S/N: JSM1-UP; T6B1-UP; 3TN1-UP; DSP1-UP; 2CS1-UP; 5NT1-UP; 5ST1-UP; 1AW1-UP; 5JY1-UP)
- 797F (S/N: LAJ1-UP; LLM1-UP; R1N1-UP)
- 963C (S/N: BBD1-UP; 7RP1-UP)
- AD45B (S/N: CXM1-UP; RHX1-UP)
- AD55 (S/N: ANW1-UP; DNW1-UP; BNT1-UP)
- AD55B (S/N: JNW1-UP; LJX1-UP)
- 980H (S/N: MHG1-UP; MDA1-UP; REB1-UP; WHL1-UP; DGZ1-UP)
- 993K (S/N: LWA1-UP; Z9K1-UP; T8C1-UP; T9C1-UP; JXJ1-UP; LJW1-UP; MRX1-UP)
- 994G (S/N: BEH1-UP; 4MT1-UP; 7RY1-UP)
The part numbers of the low coolant level sensors are listed below. The sensor is a significant warning device. The sensor will detect a low coolant level. The sensor will detect a loss of coolant so that damage to the engine from this condition may be avoided.
- 107-0174 Coolant Level Sensor
- 165-6634 Liquid Level Sensor Gp
- 204-2518 Coolant Level Sensor Gp
- 239-9957 Coolant Level Sensor
If a major coolant loss occurs during highly loaded engine conditions, the sensor can detect the loss of coolant. This detection will allow the monitoring system to warn the operator. The operator can then take action in order to protect the engine. In comparison to the coolant temperature sensor, the sensor has a faster response time. This difference is due to the time between the loss of coolant and the sufficient heating of the coolant sensor in order to trip the warning or protective action.
Theory of Operation
The low coolant sensor is an electronic device that measures capacitance. The capacitance that is measured from the probe that is surrounded by coolant, and the capacitance that is measured from the probe that is surrounded by air is different. The output characteristics of the sensors are shown in 1.
| Coolant Level Sensor Gp | Dry Output | Submerged Output |
| 107-0174 | 0 VDC | Open Circuit |
| 165-6634 | 5 VDC | 0 VDC |
| 204-2518 | 5 VDC | 0 VDC |
| 239-9957 | 5 VDC | 0 VDC |
Critical Surfaces of the Sensor
 | |
| Illustration 1 | g01228306 |
(1) Tie wrap
(2) Body
(3) Probe
The critical surfaces of the sensor are body (2) and probe (3). The sensor body and the probe must not electrically connect to each other. The probe is encased in a clear plastic sheath. The sheath is a nonconductive material that insulates the probe from surrounding conditions (coolant, steam, or air). This sheath extends into the body of the sensor and the sheath ensures that the probe is isolated from the sensor body.
Note: Coolant is conductive. When coolant is in contact with the threads of the sensor body, the coolant becomes an extension of the sensor body. The sensor's electronics will then measure the capacitance between the probe and the sensor body.
| NOTICE |
|---|
Important - if the plastic sheath develops a leak for any reason, the coolant will short the probe tip to the body, rendering the sensor non-functional. Make sure that the plastic sheath is intact. |
Installation Notes
Special Care During Installation
Often during installation, sensors are damaged. When you are installing the sensor, you must be careful to ensure that the sensor probe is not cut by the threads of the mounting boss. The sensor probe can also be scratched by the threads of the mounting boss.
Installation on Generators with a Lifting Eye on the Radiator
If the sensor is installed in a radiator in a location directly behind a lifting eye, you must cut the tie wrap from the adapter harness. Next, disconnect the adapter harness and remove the adapter harness before installing the sensor. After the sensor is installed and the adapter harness reconnected, install another tie wrap.
Service Note
Engine Cleaning or Washing
 | |
| Illustration 2 | g01597677 |
(2) Sensor body | |
Direct pressurized spray may penetrate the seals of the sensor. Also, direct pressurized spray will damage the sensor. Damage to the sensor can affect the output of the sensor. If you are washing the equipment, do not spray the sensor directly with pressures that exceed 34 kPa (5 psi).