| Parameter | Specification |
|---|---|
| COGENG Part Number | 6219-81-1990 |
| OEM Equivalent | Komatsu 6219-81-1990 |
| Product Type | Engine Oil Pressure Sensor (Analog Sender) |
| Output Type | Variable resistance / Analog voltage |
| Application | Real-time engine oil pressure monitoring |
| Mounting Type | Threaded direct fit |
| Brand | Part Number |
|---|---|
| COGENG | 6219-81-1990 (replaces OEM) |
| Komatsu | 6219-81-1990 |
| Interchange | 6219-81-1991, 6219-81-1992, 6219-81-1993, 600-825-1510 |
| Parameter | Specification |
|---|---|
| System Voltage | 24V DC (Komatsu standard) |
| Output Type | Analog (variable resistance / voltage divider) |
| Resistance Range (0 bar) | 10 - 20 Ω (typical) |
| Resistance Range (10 bar) | 90 - 110 Ω (typical) |
| Output Voltage (0 bar) | Approx. 0.5 V (depending on pull-up) |
| Output Voltage (10 bar) | Approx. 4.5 V (depending on pull-up) |
| Signal Type | Variable ground (sender to ground) |
| Response Time | < 50 ms |
| Accuracy | ±3% of full scale |
| Insulation Resistance | ≥100MΩ @ 500V DC |
| Dielectric Strength | 500V AC/60s No Breakdown |
| Electrical Connection | 1-pin (signal) or 2-pin (signal + ground) |
| Parameter | Specification |
|---|---|
| Pressure Range | 0 - 10 bar (0 - 145 psi) |
| Maximum Overload Pressure | 15 bar (217 psi) |
| Burst Pressure | 30 bar (435 psi) |
| Pressure Sensing Element | Piezoresistive / Wiper potentiometer |
| Hysteresis | ≤1% of full scale |
| Pressure (bar) | Pressure (psi) | Typical Resistance (Ω) | Typical Voltage (24V system)* |
|---|---|---|---|
| 0 | 0 | 10 - 20 | 0.2 - 0.4 V |
| 1 | 14.5 | 18 - 28 | 0.4 - 0.7 V |
| 2 | 29.0 | 26 - 36 | 0.6 - 0.9 V |
| 3 | 43.5 | 34 - 44 | 0.8 - 1.1 V |
| 4 | 58.0 | 42 - 52 | 1.0 - 1.3 V |
| 5 | 72.5 | 50 - 60 | 1.2 - 1.5 V |
| 6 | 87.0 | 58 - 68 | 1.4 - 1.7 V |
| 7 | 101.5 | 66 - 76 | 1.6 - 1.9 V |
| 8 | 116.0 | 74 - 84 | 1.8 - 2.1 V |
| 9 | 130.5 | 82 - 92 | 2.0 - 2.3 V |
| 10 | 145.0 | 90 - 110 | 2.2 - 2.6 V |
*Note: Output voltage depends on ECU/gauge pull-up resistor (typically 100-150Ω to 24V). Values are approximate.
| 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 |
| Pressure Port Material | Brass / Stainless Steel |
| Electrical Connection | 1-pin blade terminal or 2-pin Deutsch |
| Weight | 0.06 kg (0.13 lbs) |
| Overall Length | 50 - 65 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) |
| Feature | This Sensor (Analog) | Basic Switch (Normally Closed) |
|---|---|---|
| Output type | Variable resistance | On/Off (open/closed) |
| Information | Actual pressure value | Only above/below threshold |
| Display | Pressure gauge reading | Warning light only |
| ECU function | Variable engine protection | Single threshold derate |
| Diagnostic value | Full pressure range | Pressure switch only |
| Application | Machines with oil pressure gauge | Basic warning systems |
Note: This analog sensor is required for machines equipped with an oil pressure gauge (not just a warning light). Verify your machine's configuration before ordering. If your machine uses only a warning light (no gauge), refer to switch-type sensor 6744-81-4010.
This analog oil pressure sensor is commonly used on Komatsu equipment equipped with oil pressure gauges, including:
| Equipment Type | Series/Models |
|---|---|
| Excavators | PC200-6, PC200-7, PC210-6, PC210-7, PC220-6, PC220-7, PC300-6, PC300-7, PC350-6, PC350-7, PC400-6, PC400-7 |
| Bulldozers | D65EX-12, D65EX-15, D85EX-12, D85EX-15, D155A-5, D155A-6, D275A-5, D275A-6 |
| Wheel Loaders | WA250-5, WA250-6, WA320-5, WA320-6, WA380-5, WA380-6, WA470-5, WA470-6 |
| Dump Trucks | HD325-6, HD325-7, HD465-6, HD465-7, HD605-6, HD605-7 |
| Engine Model | Application | Analog Gauge |
|---|---|---|
| Komatsu S6D95L | PC200-7, PC220-7 | Yes (gauge) |
| Komatsu SAA6D107E | PC210-8, PC240-8 | Yes (gauge) |
| Komatsu SAA6D114E | PC300-8, PC350-8, PC360-8 | Yes (gauge) |
| Komatsu SAA6D125E | PC400-8, PC450-8 | Yes (gauge) |
| Komatsu SAA6D140E | D275A-5, D375A-6, HD465-7 | Yes (gauge) |
Note: Verify your machine has an oil pressure gauge (not just a warning light) before ordering this analog sensor. For machines with only a warning light, use switch-type sensor (e.g., 6744-81-4010). Contact COGENG with your machine serial number for exact compatibility confirmation.
The sensor contains a variable resistor (potentiometer) or piezoresistive element that changes resistance proportionally to oil pressure:
| Condition | Pressure | Resistance | Gauge Reading |
|---|---|---|---|
| Engine off | 0 bar | 10-20 Ω | Zero (bottom) |
| Idle (warm oil) | 1-2 bar | 18-36 Ω | Low-normal |
| Working RPM | 3-6 bar | 34-68 Ω | Normal range |
| High load | 5-8 bar | 50-84 Ω | High-normal |
| Overload / cold oil | 7-10 bar | 66-110 Ω | Maximum reading |
| Feature | Benefit |
|---|---|
| Precision calibration | Accurate resistance curve matches Komatsu specification |
| Oil-resistant element | NBR / Viton compatible with all engine oils |
| Corrosion-resistant housing | Zinc-plated steel / brass |
| Direct fit thread | 1/8" BSPT or PT (Komatsu standard) |
| 100% factory tested | Every sensor individually tested |
| Analog output | Full pressure range for gauge display |
| Sealed construction | IP67 rated for engine environment |
| 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 | SWITCH,PRESSURE | 1 |
| 13 | 6219-81-1990 | • Pressure Sensor | 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 |
| Icon | Meaning |
|---|---|
| 🔥 | Hot fluid hazard - Cold operation mandatory |
| ⚡ | Electrical damage risk - Disconnect battery first |
| ⚠️ | Precision torque required - Never estimate |
| 🔧 | Special tool needed - Do not improvise |
Safety Preparation:
Operate on COLD ENGINE ONLY
Release residual oil pressure (prevent hot oil spray hazards)
Disconnect electrical plug:
Palm-up insertion → Rotate wrist 30° to unlock latch (critical for confined spaces)
Tool Adaptation:
Use 24mm THIN-WALL SOCKET
Standard sockets too thick (custom machining required)
Tool assembly sequence:Socket head → Short extension bar → 1/2" drive ratchet
Max. total length: 5cm (clearance constraint)
Sealing Procedure:
Clean threaded bore thoroughly
MANDATORY: Use magnetic retrieval tool to remove metal debris
*80% failures caused by debris-induced blockage*
NO sealant/PTFE tape required
OEM metal-to-metal conical sealing design
Torque Control:
Two-stage tightening sequence:
Step 1: Pre-tighten to 15 N·m
Step 2: Final torque 30±3 N·m
⚠️ EXCEEDING TORQUE CRACKS PIEZO ELEMENT!
🔬 Fault Diagnosis & Testing Protocol
Dashboard display: Code89 (Oil pressure circuit malfunction)
ECU log: PID 100 FMI 03 (Signal circuit open)
| State | Resistance (Between 2 Pins) | Diagnosis |
|---|---|---|
| Normal standby | 0 Ω (contacts closed) | Low-pressure alert ready |
| Pressure >0.18MPa | ∞ (open circuit) | Normal pressure achieved |
| Complete failure | Permanent ∞ | Internal breakage - Replace |
Operational Verification:
Set multimeter to Ω range
Connect probes:
Red → Center terminal
Black → Sensor body (ground path)
Interpret readings:
Normal: ≈3Ω (includes probe resistance)
Faulty: Permanent open circuit (regardless of probe polarity)
Q1: Which Komatsu equipment models use the 6219-81-1990 engine oil pressure sensor?
A: This analog oil pressure sender is designed for specific Komatsu excavators, dozers, and wheel loaders requiring OEM part number 6219-81-1990. Please verify compatibility with your machine model and serial number before ordering.
Q2: Is this an OEM or aftermarket sensor?
A: It is an OEM-grade premium replacement sensor, manufactured to meet or exceed original Komatsu quality standards for accuracy, durability, and reliable performance.
Q3: What is the difference between this analog sensor and a pressure switch?
A: This is an analog signal sender unit that provides variable oil pressure readings to your dashboard gauge. Unlike a simple on/off switch, it continuously reports actual pressure levels for accurate monitoring.
Q4: What symptoms indicate I need to replace my oil pressure sender?
A: Common signs include erratic or zero oil pressure gauge readings, gauge stuck at maximum, inaccurate pressure display, oil pressure warning light issues, or no signal from the sensor.
Q5: Is this sensor plug-and-play?
A: Yes, it is designed for direct plug-and-play replacement with OEM-spec threads and electrical connector – no modifications or special tools required for installation.
Q6: How do I purchase the COGENG 6219-81-1990 engine oil pressure sensor?
A: Contact us with your Komatsu machine model and serial number for fitment verification, then order directly through our website or sales team for fast shipping.
Contact COGENG
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