| Parameter | Specification |
|---|---|
| COGENG Part Number | 6744-81-4010 |
| OEM Equivalent | Komatsu 6744-81-4010 |
| Product Type | Engine Oil Pressure Sensor/Switch |
| Output Type | Switch (Normally Closed / Normally Open) |
| Application | Engine oil pressure monitoring |
| Mounting Type | Threaded direct fit |
| Brand | Part Number |
|---|---|
| COGENG | 6744-81-4010 |
| Komatsu | 6744-81-4010 |
| Interchange | 6744-81-4011, 6744-81-4012, 600-811-8510 |
| Parameter | Specification |
|---|---|
| System Voltage | 24V DC (Komatsu standard) |
| Switch Type | Normally Closed (NC) or Normally Open (NO) |
| Activation Pressure | 0.3 - 0.5 bar (4.3 - 7.2 psi) typical |
| Deactivation Pressure | 0.2 - 0.4 bar (2.9 - 5.8 psi) typical |
| Contact Rating | 1A @ 24V DC |
| Electrical Connection | 1-pin or 2-pin sealed connector |
| Insulation Resistance | ≥100MΩ @ 500V DC |
| Dielectric Strength | 500V AC/60s No Breakdown |
| Parameter | Specification |
|---|---|
| Pressure Range | 0 - 10 bar (0 - 145 psi) |
| Switch Point (Rising) | 0.4 bar ± 0.1 bar (5.8 psi ± 1.45 psi) |
| Switch Point (Falling) | 0.3 bar ± 0.1 bar (4.3 psi ± 1.45 psi) |
| Differential / Hysteresis | Approx. 0.1 bar (1.45 psi) |
| Maximum Overload Pressure | 15 bar (217 psi) |
| Burst Pressure | 30 bar (435 psi) |
| Parameter | Specification |
|---|---|
| Thread Size | 1/8" BSPT or 1/8" PT (tapered) |
| Hex Size | 19 mm (3/4") or 21 mm |
| Housing Material | Zinc-plated steel / Brass |
| Diaphragm Material | NBR / Viton (oil resistant) |
| Terminal Material | Tin-plated brass |
| Weight | 0.05 kg (0.11 lbs) |
| Overall Length | 45 - 55 mm |
| Parameter | Rating |
|---|---|
| Operating Temperature | -30°C to +100°C (-22°F to +212°F) |
| Storage Temperature | -40°C to +105°C (-40°F to +221°F) |
| Vibration Resistance | 10G @ 50-500Hz |
| Ingress Protection | IP65 / IP67 |
| Fluid Compatibility | Engine oil (mineral, synthetic) |
| Corrosion Protection | Zinc plating / Passivation |
| Parameter | Value |
|---|---|
| Installation Torque | 15-20 Nm (11-15 ft-lbs) |
| Caution | Do not overtighten; thread sealant not required (tapered thread) |
This oil pressure sensor is commonly used across a wide range of Komatsu equipment, including
| Equipment Type | Series/Models |
|---|---|
| Excavators | PC200, PC210, PC220, PC300, PC350, PC400, PC450 -5, -6, -7, -8 series |
| Bulldozers | D65, D85, D155, D275, D375 -5, -6, -8 series |
| Wheel Loaders | WA250, WA320, WA380, WA470, WA500 -5, -6, -7 series |
| Dump Trucks | HD325, HD465, HD605 -5, -6, -7 series |
| Backhoe Loaders | WB140-2, WB150-2 |
| Engine Model | Application |
|---|---|
| Komatsu SAA6D107E | PC210-8, PC240-8 |
| Komatsu SAA6D114E | PC300-8, PC350-8, PC360-8 |
| Komatsu SAA6D125E | PC400-8, PC450-8 |
| Komatsu SAA6D140E | D275A-5, D375A-6, HD465-7 |
| Komatsu S4D95LE | WB140-2, WA250-5 |
| Komatsu S6D95L | PC200-7, PC220-7 |
Note: Verify with your equipment manual or contact COGENG with your machine serial number for exact compatibility confirmation.
| Condition | Switch State | Warning Light | ECU Action |
|---|---|---|---|
| Engine off / no pressure | Closed (NC) | ON / Lit | — |
| Engine running (normal pressure >0.5 bar) | Open (NC) | OFF | Normal operation |
| Low pressure (<0.3 bar) | Closed (NC) | ON / Flashing | Reduce power / Derate |
| Critical low pressure (<0.2 bar) | Closed (NC) | ON / Flashing | Engine shutdown protection |
| NO | Number | Name | Qty |
| 1 | 6271-81-9200 | SENSOR,POSITION | 2 |
| 1 | 6754-81-9200 | SENSOR ASS'Y,POSITION | 2 |
| 1 | 6754-81-8410 | • BRACKET | 1 |
| 1 | 6271-81-9220 | • O-RING | 1 |
| 1 | 6261-81-2920 | • O-RING | 1 |
| 2 | 6216-84-9220 | BOLT | 2 |
| 3 | 6754-81-9120 | BRACKET | 1 |
| 4 | 6735-61-2120 | BOLT | 3 |
| 5 | 6754-81-9110 | ISOLATOR | 3 |
| 6 | 6754-81-9130 | ISOLATOR | 3 |
| 7 | 6754-81-9140 | SUPPORT | 1 |
| 8 | 6754-81-9150 | BOLT | 3 |
| 9 | 6754-81-9170 | WIRE | 1 |
| 10 | 6216-74-6180 | BOLT | 1 |
| 11 | 6261-81-1900 | SENSOR,PRESSURE | 1 |
| 12 | 6734-71-5520 | BOLT | 1 |
| 13 | 6744-81-4010 | Oil Pressure Sensor | 1 |
| 13 | 6219-81-1990 | • O-RING | 1 |
| 14 | 6261-81-6901 | SENSOR ASS'Y,TEMPERATURE | 1 |
| 14 | 6261-81-6900 | SENSOR ASS'Y,TEMPERATURE | 1 |
| 14 | 6216-84-9740 | • SEAL | 1 |
| 15 | 6216-84-2130 | PLATE | 1 |
| 15 | 600-460-3000 | PLATE | 1 |
| 16 | 6754-81-2701 | SENSOR ASS'Y,PRS TEMPERATURE | 1 |
| 16 | 6754-81-2710 | • O-RING | 1 |
| 17 | 01584-00605 | NUT | 2 |
| 18 | 6754-81-9180 | SCREW | 1 |
| 19 | 6751-81-9110 | BRACKET | 1 |
| 20 | 6754-81-9160 | BOLT | 5 |
| 21 | 6751-81-2110 | ADAPTER | 1 |
| 22 | 6751-81-9121 | BOLT | 1 |
| 23 | 6751-81-9130 | WASHER | 2 |
⏱️ 3-Step Quick Replacement (No Oil Drain Required):
Operate on COLD ENGINE CONDITION.
Loosen old sensor counterclockwise (Torque ≤ 30 N·m).
⚠️ CRITICAL! Use a magnetic retrieval tool to extract residual metal debris (80% failures caused by debris).
Wrap 1.5 turns of PTFE sealant tape (included) on threads.
Tighten clockwise to 25±3 N·m (➔ EXCEEDING TORQUE DAMAGES SENSOR!).
Red wire → 24V+
Black wire → GND
Yellow wire → ECU signal terminal (Pin #32)
Post-Install Test:
Start engine and measure signal voltage:
Normal: ≈0.5V @ idle (Oil pressure >0.3 MPa)
DANGER: <0.2V → STOP ENGINE IMMEDIATELY! (Oil passage blockage suspected)
Sealant Tip: Apply PTFE tape clockwise to prevent unraveling during installation.
Torque Sequence:
Finger-tighten → 15 N·m → Final torque 25 N·m (use crisscross pattern).
Signal Validation:
0.15 MPa = 0.2V (alarm trigger point)
0.50 MPa = 1.8V
10.0 MPa = 4.5V
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net Facebook: Excavator SolenoidValve
#ExcavatorWiringHarness #ExcavatorThrottleMotor #ExcavatorSolenoidValve #ExcavatorSealKit
