Caterpillaroff-highway trucktruck
Caterpillar 769B
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 769B is a rigid off-highway rock truck designed for heavy construction and mining applications. Produced between 1967 and 1978, this series features a D343 6-cylinder engine delivering 415 hp at 1900 rpm. The machine operates in a weight class with an empty weight of approximately 27,560 kg (60,759.4 lb) and a loaded weight of 31,800 kg (70,107 lb). It utilizes a 9-speed forward and 3-speed reverse power shift transmission and is configured with a V-floor dump body for efficient material discharge.
The 769B introduced critical design improvements over the original 769, specifically transitioning to a steel cab construction and a redesigned dump body. It also updated operator access via a left-front ladder system. In today's used equipment market, the 769B remains a significant asset due to its durable chassis and the availability of aftermarket parts. Its lineage continued through the 769C and 7-series variants until being replaced by the 38-ton capacity 770 model.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Caterpillar 769B specifications
Engine
| Model | D343 |
| Gross Power | 415 hp |
| Power at RPM | 1900 rpm |
| Displacement | 891 cu in |
| Cylinders | 6 |
| Bore x Stroke | 5.4 in x 6.5 in |
Weights
| Empty Weight | 27,561.3 kg (60,759.4 lb) |
| Loaded Weight | 31,803.5 kg (70,107 lb) |
| Weight Distribution (Empty) Front | 49% |
| Weight Distribution (Empty) Rear | 51% |
| Weight Distribution (Loaded) Front | 33% |
| Weight Distribution (Loaded) Rear | 67% |
Dimensions
| Overall Length | 7.8 m (25.6 ft) |
| Overall Width | 3.55 m (11.65 ft) |
| Overall Height | 3.91 m (12.83 ft) |
| Wheelbase | 3.6 m (11.82 ft) |
| Ground Clearance | 1.42 ft (0.43 m) |
| Dump Ground Clearance | 1.22 ft (0.37 m) |
Performance
| Transmission Type | Power shift |
| Number of Forward Gears | 9 |
| Number of Reverse Gears | 3 |
Service capacities (summary)
| Fuel Capacity | 511 L (135 gal) |
| Cooling System Fluid Capacity | 102 L (27 gal) |
| Differential and Final Drive Fluid Capacity | 12.5 L (3.3 gal) |
| Steering System Fluid Capacity | 48.5 L (12.8 gal) |
| Brake/Hoist System Fluid Capacity | 227 L (60 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
769B fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase | Not specified | Cat DEO (Diesel Engine Oil); use SAE 10W-30 for ambient temperatures between -18°C (0°F) and 40°C (104°F). Use higher viscosity if required by cold start needs; use SAE 50 for hot climates only. |
| Cooling System | 102.2 liters (27 US gal) | Cat ELC (Extended Life Coolant) |
| Fuel Tank | 511.0 liters (135 US gal) | Not specified |
| Transmission/Powertrain | Not specified | Cat TDTO (Transmission/Drive Train Oil); use SAE 10W/30/50. Use Cat TDTO Cold Weather for operations below -25°C. |
| Final Drives | 12.5 liters (3.3 US gal) | Cat TDTO (Transmission/Drive Train Oil) |
| Hydraulic System and Tank | 48.45 liters (12.8 US gal) for steering; 227.16 liters (60 US gal) for brake/hoist system | Cat HYDO Advanced 10 (for cold to moderate temperatures) or Cat HYDO Advanced 30 (for moderate to hot temperatures) |
| Grease | Not specified | Varies by application: Cat Multipurpose Grease (low-load/low-speed); Cat Advanced 3Moly Grease (medium-load/medium-speed); Cat Ultra 5Moly Grease (high-load/high-speed) |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 769B maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the 769B beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize S.O.S fluid analysis to monitor the D343 engine and hydraulic systems. Regularly sample engine oil for wear metals like iron or copper, and check hydraulic fluid for particle counts and oxidation. Monitoring coolant for sodium or glycol levels prevents internal corrosion. Early detection of fuel dilution or silicon contamination through sampling protects expensive components from catastrophic failure.
Corrective & Common Repairs
Address common issues such as hydraulic hose abrasions, leaks, or cracks immediately to prevent pump cavitation. Monitor the power shift transmission for pressure drops and inspect steering system components for leaks in the 48.4 L (12.8 gal) reservoir. Watch for radiator fin debris that causes overheating. Ensure all brake and hoist system seals are intact to maintain the 227 L (60 gal) fluid capacity.
Overhaul & Rebuild Points
Plan major overhauls around the 2,000-hour milestone. Focus on comprehensive structural inspections of the frame and dump body bolsters. Evaluate the condition of the turbocharger and engine cylinder heads. During transmission rebuilds, inspect all gears and friction components. Major component evaluation should include checking the integrity of the ROPS attachments and heavy-duty castings in high-stress areas.
Seasonal & Environment Servicing
In dusty or quarry environments, check air filters daily and clean radiator fins frequently to prevent overheating. For hot-weather operations, consider shorter engine oil intervals. In cold climates, ensure the use of appropriate winter-grade lubricants and inspect all hoses for weather cracking. Always verify tire inflation and condition, as extreme temperature shifts impact pressure in 18.00-25 tires.
769B fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E360 | Engine Coolant Temperature — High | Low coolant level, failed thermostat, or water pump issue | Diagnose cooling system; do not operate until resolved |
| E361 | Engine Coolant Temperature — Very High (Shutdown) | Severe cooling system failure | Engine shutdown required; perform full cooling system diagnosis |
| 110-0 | Engine Coolant Temp — Above Normal | Low coolant level or thermostat failure | Inspect cooling system, refill coolant, and test thermostat |
| 110-3 | Engine Coolant Temp Sensor — Voltage High | Open circuit or sensor failure | Check wiring and replace sensor if confirmed faulty |
| 174-3 | Engine Fuel Temperature — Voltage Above Normal | Open circuit in sensor wiring | Inspect harness and replace sensor if necessary |
| 190-8 | Engine Speed — Abnormal Frequency | Speed sensor air gap, sensor failure, or tone ring damage | Check sensor gap and test speed sensor and tone ring |
| 2458-2 | DPF #1 Differential Pressure — Erratic | Plugged pressure ports or failing sensor | Clean pressure ports and test sensor; verify DPF soot load |
| 41-3 | 8-Volt DC Supply — Voltage Above Normal | Short to power on 8V reference circuit | Inspect sensors sharing the 8V supply and isolate fault |
| 41-4 | 8-Volt DC Supply — Voltage Below Normal | Short to ground on 8V reference circuit | Disconnect sensors one at a/time to locate short |
| 2348-9 | SAE J1939 Data Link #2 — Abnormal Update Rate | CAN bus wiring damage or termination fault | Check CAN wiring and measure termination resistance |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
769B attachments & work tools
Body and Payload Customization
Custom attachments include tail extensions, liner packages, and sideboards to maintain rated payload. Standard bodies may feature exhaust heating options.
Integrated Technology and Control Systems
Optional attachments integrate with the CAT Data Link System. Available configurations include Truck Production Management System (TPMS), Automatic Retarder Control (ARC), and Traction Control System.
Exhaust and Environmental Configurations
Standard body configurations may include a full-time muffler or an exhaust diverter option.
Protective Guarding and Structures
The machine features a Rollover Protection Structure (ROPS) that attaches to four castings welded into the frame. The cab is provided as an integral, sound-suppressed ROPS/FOPS unit.
All 769B assemblies by section
Every catalogued assembly group for the Caterpillar 769B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
Air And Hydraulic Brake Control--Side View Part 1 Of 2--Type 1
Air And Hydraulic Brake Control--Front View Part 2 Of 2--Type 1
Air And Hydraulic Brake Control--Front View--Part 2 Of 2--Type 2
Air And Hydraulic Brake Control--Side View--Part 1 Of 2--Type 2
9m4824 Air Motor Assembly
| 9M***24 | Air Motor Assembly | 1 |
8m6159 Air Starting Arrangement--Factory Installation
| 1S***79 | Air Starting Control Group | 1 |
| 7M***12 | Air Starting Motor Group | 1 |
| 7M***44 | Electrical System Group | 1 |
1s479 Air Starting Control Group--Lower Half -Part 2 Of 2
| 1S***79 | Air Starting Control Group | 1 |
1s479 Air Starting Control Group--Upper Half- Part 1 Of 2
| 1S***79 | Air Starting Control Group | 1 |
7m2212 Air Starting Motor Group
| 7M***12 | Air Starting Motor Group | 1 |
4j1943 Air Valve Assembly
| 4J***43 | Air Valve Assembly | 1 |
7d2621 Alarm Assembly
| 7D***21 | Alarm Assembly | 1 |
1s2585 Alternator Assembly--12 Volt, 55 Ampere--Type 1
| 1S***85 | Alternator Assembly | 1 |
1s2585 Alternator Assembly--12 Volt, 55 Ampere--Type 2
| 1S***85 | Alternator Assembly | 1 |
9m6517 Alternator Group--12 Volt, 55 Ampere
| 9M***17 | Alternator Group | 1 |
7m6372 Back-Up Light Group--12 Volt
| 7M***72 | Back-Up Light Group | 1 |
8m3864 Back-Up Light Group--24 Volt
| 8M***64 | Back-Up Light Group | 1 |
8m3896 Back-Up Warning Group--24 Volt--Type 1
| 8M***96 | Back-Up Warning Group | 1 |
8m3896 Back-Up Warning Group--24 Volt--Type 2
| 8M***96 | Back-Up Warning Group | 1 |
7m6371 Back-Up Warning Group--12 Volt--Type 1
| 7M***71 | Back-Up Warning Group | 1 |
7m6371 Back-Up Warning Group--12 Volt--Type 3
| 7M***71 | Back-Up Warning Group | 1 |
8m3896 Back-Up Warning Group--24 Volt--Type 3
| 8M***96 | Back-Up Warning Group | 1 |
7m6371 Back-Up Warning Group--12 Volt--Type 2
| 7M***71 | Back-Up Warning Group | 1 |
7d9375 Basic Alarm Group--24 Volt--Type 2
| 7D***75 | Basic Alarm Group | 1 |
7d9376 Basic Alarm Group--12 Volt--Type 4
| 7D***76 | Basic Alarm Group | 1 |
7d9375 Basic Alarm Group--24 Volt--Type 1
| 7D***75 | Basic Alarm Group | 1 |
7d9376 Basic Alarm Group--12 Volt--Type 1
| 7D***76 | Basic Alarm Group | 1 |
7d9376 Basic Alarm Group--12 Volt--Type 3
| 7D***76 | Basic Alarm Group | 1 |
7d9376 Basic Alarm Group--12 Volt--Type 2
| 7D***76 | Basic Alarm Group | 1 |
7d9375 Basic Alarm Group--24 Volt--Type 3
| 7D***75 | Basic Alarm Group | 1 |
7d9376 Basic Alarm Group--12 Volt--Type 5
| 7D***76 | Basic Alarm Group | 1 |
7m8274 Brake Master Cylinder Assembly
| 7M***74 | Brake Master Cylinder Assembly | 1 |
9m5516 Brake Oil Cooler Group
| 9M***16 | Brake Oil Cooler Group | 1 |
8m3792 Cab Heater Group--24 Volt
| 8M***92 | Cab Heater Group | 1 |
5d5240 Cab Heater Group--12 Volt
| 5D***40 | Cab Heater Group | 1 |
5d5250 Cab Heater Group--24 Volt
| 5D***50 | Cab Heater Group | 1 |
8m3894 Cab Heater Group--12 Volt
| 8M***94 | Cab Heater Group | 1 |
8d246 Cab Visor Group
| 8D***46 | Cab Visor Group | 1 |
5d1910 Protection Cover Group--Hydraulic Tank Cap
| 5D***10 | Cover Group-Protection; Protection Cover Group Hydraulic Tank Cap | 1 |
2s3025 Protection Cover Group--Oil Filler Cap
| 2S***25 | Cover Group-Protection; Protection Cover Group | 1 |
9s8813 Downshift Blocker Group
| 9S***13 | Downshift Blocker Group | 1 |
1s4860 Drive Assembly
| 1S***60 | Drive Assembly | 1 |
5d7030 Electrical System Group--12 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 2 Of 7
| 5D***30 | Electrical System Group | 1 |
7m5544 Electrical System Group--12 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 1 Of 7
| 7M***44 | Electrical System Group | 1 |
5d7030 Electrical System Group--12 Volt--Batteries--Part 7 Of 7
| 5D***30 | Electrical System Group | 1 |
5d7030 Electrical System Group--12 Volt--Front Portion As Viewed From Left Hand Side Of Truck--Part 1 Of 7
| 5D***30 | Electrical System Group | 1 |
7m5544 Electrical System Group--12 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 3 Of 7
| 7M***44 | Electrical System Group | 1 |
5d7030 Electrical System Group--12 Volt--Rear Portion As Viewed From Front Left Hand Side Of Truck--Part 4 Of 7
| 5D***30 | Electrical System Group | 1 |
7m5544 Electrical System Group--12 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 2 Of 7
| 7M***44 | Electrical System Group | 1 |
7m5544 Electrical System Group--12 Volt--As Viewed From Side Of Truck--Part 6 Of 7
| 7M***44 | Electrical System Group | 1 |
5d7030 Electrical System Group--12 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 3 Of 7
| 5D***30 | Electrical System Group | 1 |
7m5544 Electrical System Group--12 Volt--Batteries--Part 7 Of 7
| 7M***44 | Electrical System Group | 1 |
5d7030 Electrical System Group--12 Volt--As Viewed From Side Of Truck--Part 6 Of 7
| 5D***30 | Electrical System Group | 1 |
7m5544 Electrical System Group--12 Volt--As Viewed From Front Of Truck--Part 5 Of 7
| 7M***44 | Electrical System Group | 1 |
7m5544 Electrical System Group--12 Volt--Rear Portion As Viewed From Front Left Hand Side Of Truck--Part 4 Of 7
| 7M***44 | Electrical System Group | 1 |
5d7030 Electrical System Group--12 Volt--As Viewed From Front Of Truck--Part 5 Of 7
| 5D***30 | Electrical System Group | 1 |
Electrical System Wiring Diagram--12 Volt System
2m856 Flood Lamp Assembly--12 Volt
| 2M***56 | Flood Lamp Assembly | 1 |
Front Brake--2 Required
8m6160 Front Brake Arrangement
| 8M***60 | Front Brake Arrangement | 1 |
8m8735 Glow Plug And Wiring Group--12 Volt
| 8M***35 | Glow Plug And Wiring Group | 1 |
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
8m9858 Tool Group
| 8M***58 | Hand Tool Group | 1 |
Additional Parts Of 8m9531 Harness Referred To On Page 174a
| 8M***31 | Harness | 1 |
2m4166 Head Lamp Assembly--12 Volt
| 2M***66 | Head Lamp Assembly | 1 |
8d3300 High Speed Oil Change Group
| 8D***00 | High Speed Oil Change Group | 1 |
9m4801 Hot Water Heater--12 Volt
| 9M***01 | Hot Water Heater | 1 |
9m4802 Hot Water Heater--24 Volt
| 9M***02 | Hot Water Heater Assembly | 1 |
9m5619 Hydraulic Lines Group
| 9M***19 | Hydraulic Lines Group | 1 |
Instrument Panel--12 Volt
7m7910 Instrument Panel Group--12 Volt
| 7M***10 | Instrument Panel Group | 1 |
8m110 Rear Tail, Stop And Reflex Lamp Assembly--12 Volt
| 8M***10 | Lamp As-Tail | 1 |
Name Plates And Transfers
| 1S***21 | Plate -Lubrication Instructions | 1 |
| 1S***34 | Plate; Shifting On Power Shift Console | 1 |
| 1S***16 | Transfer- Caterpillar | 2 |
Rear View Of 7m7906 Panel Assembly Portion Of This Instrument Panel Shown On Page 174
| 7M***06 | Panel Assembly Portion Of This Instrument | 1 |
Rear View Of 6d496 Panel Portion Of Instrument Panel Shown On Page 174b
| 6D***96 | Panel Portion Of This Instrument | 1 |
7m5383 Passenger Seat Group--R.H.
| 7M***83 | Passenger Seat Group--R.H. | 1 |
5d1920 Protection Cover Group--Fuel Tank Cap
| 5D***20 | Protection Cover Group-Fuel Tank Cap; Protection Cover Group | 1 |
8d200 Rear Vision Mirror Group--R.H.--Fender Mounted
| 8D***00 | Rear View Mirror Group | 1 |
7m6368 Rear Vision Mirror Group--R.H.--Fender Mounted
| 7M***68 | Rear Vision Mirror Group | 1 |
9m3990 Rear Vision Mirror Group--L.H.--Cab Mounted
| 9M***90 | Rear Vision Mirror Group | 1 |
6d1180 Rear Vision Mirror Group--L.H.--Type 2
| 6D***80 | Rear Vision Mirror Group--L.H. | 1 |
6d1180 Rear Vision Mirror Group--L.H.--Type 1
| 6D***80 | Rear Vision Mirror Group--L.H. | 1 |
9m5618 Rear Wheel Brake Cooler Arrangment
| 9M***16 | Brake Oil Cooler Group | 1 |
| 9M***18 | Rear Wheel Brake Cooler Arrangment | 1 |
| 9M***19 | Hydraulic Lines Group | 1 |
9m9324 Recording Tachograph Group--24 Volt--Top View--Type 1
| 9M***24 | Recording Tachograph Group | 1 |
9m9324 Recording Tachograph Group--24 Volt--Top View--Type 2
| 9M***24 | Recording Tachograph Group | 1 |
9m9323 Recording Tachograph Group--12 Volt--Top View--Type 1
| 9M***23 | Recording Tachograph Group | 1 |
9m9323 Recording Tachograph Group--12 Volt--Top View--Type 2
| 9M***23 | Recording Tachograph Group | 1 |
9m4509 Rotochamber
| 9M***09 | Rotochamber | 1 |
8m3898 Sun Visor Group
| 8M***98 | Sun Visor Group | 1 |
6d1930 Tachometer And Tachograph Drive Group
| 6D***30 | Tachometer And Tachograph Drive Group | 1 |
9s7978 Tool Group
| 9S***78 | Tool Group-Hand | 1 |
Tools
4d3278 Control Valve Assembly
| 4D***78 | Valve Group-Air Control; -Parking Brake Switch | 1 |
5d2830 Windshield Washer Group
| 5D***30 | Windshield Washer Group | 1 |
Diesel Engine
Aftercooler (9m4825 N/S)
| 9M***25 | Aftercooler Group; Aftercooler Group | 1 |
Air Cleaner--Right Hand Side View
Air Compressor
2s2765 Air Compressor Assembly
| 2S***65 | Air Compressor Assembly | 1 |
Air Compressor Drive
1s2584 Alternator Assembly--24 Volt, 45 Ampere
| 1S***84 | Alternator Assembly | 1 |
9m4180 Alternator Group--24 Volt, 45 Ampere
| 9M***80 | Alternator Group | 1 |
9m8398 Box Assembly
| 9M***98 | Box Assembly | 1 |
5d6529 Box Assembly
| 5D***29 | Box Assembly | 1 |
Breather
Camshaft
Camshaft Drive
5m8271 Air Compressor Assembly
| 5M***71 | Compressor As | 1 |
Connecting Rod And Piston--6 Required
Crankshaft
Crankshaft Bearing Replacement Groups
Crankshaft Bearing Replacements
Cylinder Block And Covers--Side View--Part 1 Of 2
Cylinder Block And Covers--End View--Part 2 Of 2
2s1803 Cylinder Block Assembly
| 2S***03 | Cylinder Block Assembly | 1 |
Cylinder Head And Valve Mechanism--End View--Part 2 Of 2
Cylinder Head And Valve Mechanism--Side View--Part 1 Of 2
1m5061 Tachometer Drive Group
| 1M***61 | Drive Group-Tachometer | 1 |
Drive Pulley And Damper
Electrical System--24 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 3 Of 7
Electrical System--24 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 2 Of 7
Electrical System--24 Volt--As Viewed From Front Of Truck--Part 5 Of 7
Electrical System--24 Volt--Batteries--Part 7 Of 7
Electrical System--24 Volt--Rear Portion As Viewed From Front Left Hand Side Of Truck--Part 4 Of 7
Electrical System--24 Volt--Front Portion As Viewed From Front Left Hand Side Of Truck--Part 1 Of 7
Electrical System--24 Volt--As Viewed From Side Of Truck--Part 6 Of 7
Electrical System Wiring Diagram--24 Volt System
Engine Oil Cooler
Engine Support
Exhaust By-Pass
Fan And Shroud--Part 2 Of 2
Fan And Shroud--Part 1 Of 2
9m3223 Oil Filter Group
| 9M***23 | Filter Group-Engine Oil; Oil Filter Group | 1 |
8h7204 Fuel Filter Group
| 8H***04 | Filter Group-Fuel | 1 |
Flywheel
Fuel Filter
Fuel Injection Pump Drive
Fuel Injection Valves And Lines
Fuel Lines
Fuel Pump Housing
Fuel System--Rear View
5m6488 Fuel Transfer Pump Group
| 5M***88 | Fuel Transfer Pump Group | 1 |
Gasket Kits
| 2R***18 | Water Pump | 0 |
| 2S***52 | Diesel Engine Complete | 0 |
| 2S***53 | Valve Grinding | 0 |
7s4280 Glow Plug And Wiring Group--24 Volt
| 7S***80 | Glow Plug And Wiring Group | 1 |
4m308 Glow Plug And Wiring Group--24 Volt
| 4M***08 | Glow Plug And Wiring Group | 1 |
8m2425 Governor Group--With Rack Limiter--Part 1 Of 2
| 8M***25 | Governor Group | 1 |
8m2425 Governor Group--With Rack Limiter--Part 2 Of 2
| 8M***25 | Governor Group | 1 |
Governor Torque Spring
Additional Parts Of 8m9531 Harness Referred To On Page 71
| 8M***31 | Harness | 1 |
Instrument Panel--24 Volt
Instrument Panel Wiring Diagram
Instrument Panel Wiring Diagram--24 Volt Or 12 Volt Systems
7m7147 Combination Stop And Tail Lamp Assembly--24 Volt
| 7M***47 | Lamp As-Stop & Tail | 1 |
1m1882 Flood Lamp Assembly--24 Volt--Type 2
| 1M***82 | Lamp Group | 1 |
1m3379 Head Lamp Assembly--24 Volt--Type 2
| 1M***79 | Lamp Group | 1 |
1m3379 Head Lamp Assembly--24 Volt--Type 1
| 1M***79 | Lamp Group | 1 |
1m1882 Flood Lamp Assembly--24 Volt--Type 1
| 1M***82 | Lamp Group | 1 |
Manifolds--As Viewed From Right Hand Side Of Engine--Part 1 Of 2
Manifolds--As Viewed From Rear Of Engine--Part 2 Of 2
2m1464 Motor Assembly--24 Volt--Part 1 Of 2
| 2M***64 | Motor Assembly | 1 |
2m1464 Motor Assembly--24 Volt--Part 2 Of 2
| 2M***64 | Motor Assembly | 1 |
9m3202 Oil Filter Base Assembly--Top View
| 9M***02 | Oil Filter Base Assembly | 1 |
Oil Lines
4m8026 Oil Pump Assembly
| 4M***26 | Oil Pump Assembly | 1 |
Rear View Of 7m7906 Panel Assembly Portion Of This Instrument Panel Shown On Page 70
| 7M***06 | Panel Assembly Portion Of This Instrument | 1 |
Rear View Of 6d496 Panel Portion Of This Instrument Panel Shown On Page 70b
| 6D***96 | Panel Portion Of This Instrument | 1 |
1s7388 Pressure Ratio Regulator Assembly
| 1S***88 | Pressure Ratio Regulator Assembly | 1 |
3s860 Pressure Ratio Regulator Assembly
| 3S***60 | Pressure Ratio Regulator Assembly | 1 |
1m7022 Fuel Priming Pump Group
| 1M***22 | Pump Group-Fuel Priming | 1 |
Radiator--As Viewed From Front Of The Truck--Part 1 Of 2
Radiator--As Viewed From Front Of Truck--Part 1 Of 2
Radiator--As Viewed From The Front Of The Truck--Part 1 Of 2
Radiator--Right Hand Side View--Part 2 Of 2
4s9643 Crankshaft Replacement Gear Group
| 4S***43 | Replacement Crankshaft Gear Group | 1 |
4m1245 Service Meter And Tachometer Drive Group
| 4M***45 | Service Meter And Tachometer Drive Group | 1 |
3s3584 Service Meter And Tachometer Drive Group
| 3S***84 | Service Meter And Tachometer Drive Group | 1 |
2s9582 Service Meter And Tachometer Drive Group
| 2S***82 | Service Meter And Tachometer Drive Group | 1 |
Speedometer And Tachometer Drive
1m7039 Electric Starter Group--24 Volt
| 1M***39 | Starter Group-Electric; Electric Starter Group | 1 |
7h7290 Disconnect Switch Assembly
| 7H***90 | Switch As-Disconnect | 1 |
4m1812 Solenoid Switch Assembly
| 4M***12 | Switch As-Solenoid | 1 |
Torque Converter Oil Pump Drive
3s1414 Turbocharger Assembly
| 3S***14 | Turbocharger Assembly | 1 |
1s9162 Turbocharger Assembly
| 1S***62 | Turbocharger Assembly | 1 |
Water Lines
2s7209 Water Pump Assembly
| 2S***09 | Water Pump Assembly | 1 |
1s8755 Water Pump Assembly
| 1S***55 | Water Pump Assembly | 1 |
6d498 Wiring Harness
| 6D***98 | Wiring Harness | 1 |
Transmission And Chassis
7m8392 Accumulator Body Group
| 7M***92 | Accumulator Body Group | 1 |
Air And Brake Control--Front Half--Top View--Part 1 Of 6
Air And Brake Control--Middle Half--Side View--Part 3 Of 6
Air And Brake Control--Front Half--Side View--Part 2 Of 6
Air And Brake Control--Top View Of Tank--Part 4 Of 6
Air And Brake Control--Rear Half--Side View--Part 6 Of 6
Air And Brake Control--Rear Half--Top View--Part 5 Of 6
Body--Part 2 Of 2
Body--Part 1 Of 2
Brake Lines--Rear Half--Top View--Part 2 Of 2
Brake Lines--Front Half--Top View -Part 1 Of 2
Brake Lines--Rear Half--Top View -Part 2 Of 2
5d3640 Brake Valve Assembly
| 5D***40 | Brake Valve Assembly | 1 |
Cab--As Viewed From Right Hand Side Of Truck--Part 2 Of 3
Cab--As Viewed From Right Hand Side Of Truck--Part 3 Of 3
Cab--As Viewed From Left Hand Side Of Truck--Part 1 Of 3
1s4298 Control Valve Assembly
| 1S***98 | Control Valve Assembly | 1 |
5d8047 Control Valve Assembly
| 5D***47 | Control Valve Assembly | 1 |
4j4826 Control Valve Group
| 4J***26 | Control Valve Group | 1 |
6d2503 Cowl Group
| 6D***03 | Cowl Group | 1 |
Cowling--As Viewed From Front Of Truck
4j4627 Cylinder Group--3.50" Bore X 14" Stroke--Type 2--Field Installation
| 4J***27 | Cylinder Group | 1 |
4j4627 Cylinder Group--3.50" Bore X 14" Stroke
| 4J***27 | Cylinder Group | 1 |
Differential And Bevel Gear (9m3946 N/S)--Top View
| 9M***46 | Differential And Bevel Gear | 1 |
Differential And Bevel Gear--Top View
8m3876 Door Group--L.H.
| 8M***76 | Door Group | 1 |
5d7930 Door Group--Right Hand
| 5D***30 | Door Group | 1 |
2d8913 Double Check Valve Assembly
| 2D***13 | Double Check Valve Assembly | 1 |
9m7784 Double Universal Joint Assembly--Type 2
| 9M***84 | Double Universal Joint Assembly | 1 |
9m7784 Double Universal Joint Assembly--Type 1
| 9M***84 | Double Universal Joint Assembly | 1 |
Drive Shaft (9m2193 N/S)
| 9M***93 | Drive Shaft | 1 |
Drive Shaft Guard
Exhaust Deflector
3d7090 Hydraulic Oil Filter Group
| 3D***90 | Filter Group-Oil | 1 |
Frame--As Viewed From Rear Right Hand Side Of Truck--Part 2 Of 2
Frame--Left Front View- Part 1 Of 2
Frame--As Viewed From Front Left Hand Side Of Truck--Part 1 Of 2
Frame--Right Rear View--Part 2 Of 2
Frame--Left Front View--Part 1 Of 2
Front Axle And Wheels--18.00 X 25 Tubeless Tires
4j9030 Front Suspension Group--2 Required
| 4J***30 | Front Suspension Group | 1 |
4j9030 Front Suspension Group--2 Groups Required
| 4J***30 | Front Suspension Group | 1 |
1s122 Governor Group
| 1S***22 | Governor Group | 1 |
2s500 Governor Group
| 2S***00 | Governor Group | 1 |
9m5587 Hoist And Steering Pump Assembly
| 9M***87 | Hoist And Steering Pump Assembly | 1 |
Hoist Control
9m1366 Hoist Cylinder Group--2 Groups Required
| 9M***66 | Hoist Cylinder Group | 1 |
Hoist Lines--As Viewed From Left Hand Side Of Truck
Hood
5d6998 Air Horn Assembly
| 5D***98 | Horn Group-Air | 1 |
5j6488 Hydraulic Oil Filter Group
| 5J***88 | Hydraulic Oil Filter Group | 1 |
4j5850 Hydraulic Oil Filter Group
| 4J***50 | Hydraulic Oil Filter Group | 1 |
9m1361 Hydraulic Pump Group
| 9M***61 | Hydraulic Pump Group | 1 |
2s1485 Lubrication Relief Valve Group
| 2S***85 | Lubrication Relief Valve Group | 1 |
7m5810 Lubrication Relief Valve Group
| 7M***10 | Lubrication Relief Valve Group | 1 |
9m6849 Override Selector Valve Group
| 9M***49 | Override Selector Valve Group | 1 |
3k6559 Parking Brake Assembly
| 3K***59 | Parking Brake Assembly | 1 |
Parking Brake Control
Planetary Final Drive
Planetary Transmission--Part 1 Of 2
Planetary Transmission--Part 2 Of 2
Platform--R.H.--Top View
Platform--L.H.--Top View
9f1996 Pneuphonic Horn
| 9F***96 | Pneuphonic Horn | 1 |
1s3216 Pressure Control Group
| 1S***16 | Pressure Control Group | 1 |
2s3532 Pressure Control Group
| 2S***32 | Pressure Control Group | 1 |
2s1398 Pressure Control Valve Group
| 2S***98 | Pressure Control Valve Group | 1 |
2s4996 Pressure Control Valve Group
| 2S***96 | Pressure Control Valve Group | 1 |
7m5826 Range Transmission Arrangement--As Viewed From The Rear Of The Truck- Part 2 Of 2
| 7M***26 | Range Transmission Arrangement | 1 |
7m5826 Range Transmission Arrangement--Right Hand Side View -Part 1 Of 2
| 7M***26 | Range Transmission Arrangement | 1 |
Rear Axle Housing--As Viewed From Left Hand Side Of Truck
6d501 Rear Brake Group
| 6D***01 | Rear Brake Group | 1 |
1s2508 Rear Brake Group
| 1S***08 | Rear Brake Group | 1 |
Rear Wheels And Brakes--18.00 X 25 Tubeless Tires
3j4887 Relay Valve Assembly
| 3J***87 | Relay Valve Assembly | 1 |
5j1919 Relief And Flow Control Valve Group
| 5J***19 | Relief And Flow Control Valve Group | 1 |
5j674 Relief Valve Group
| 5J***74 | Relief Valve Group | 1 |
8m6334 Safety Reset And Converter Hold Valve Group
| 8M***34 | Safety Reset And Converter Hold Valve Group | 1 |
Seat--L.H.--Side View--Part 1 Of 2
Seat--L.H.--Front View--Part 2 Of 2
1s2332 Seat Assembly
| 1S***32 | Seat Assembly | 1 |
7m8391 Selector Body Group
| 7M***91 | Selector Body Group | 1 |
2s7856 Selector Body Group
| 2S***56 | Selector Body Group | 1 |
5m4599 Selector Valve Group
| 5M***99 | Selector Valve Group | 1 |
9m4351 Selector Valve Group
| 9M***51 | Selector Valve Group | 1 |
2s7855 Selector Valve Group
| 2S***55 | Selector Valve Group | 1 |
Steering Gear And Mounting
9m7592 Steering Gear Assembly
| 9M***92 | Steering Gear Assembly | 1 |
Steering Lines--As Viewed From Left Hand Side Of Truck -Part 1 Of 2
Steering Lines--As Viewed From Left Hand Side Of Truck--Part 1 Of 2
Steering Lines--Top View Part 2 Of 2
Steering Lines--Top View--Part 2 Of 2
Steering Linkage--Part 1 Of 2
Steering Linkage--Part 2 Of 2
4j8770 Rear Suspension Group--2 Required
| 4J***70 | Suspension Group-Rear | 1 |
Tank And Valve--Part 2 Of 2--Type 1
Tank And Valve--Part 1 Of 2--Type 2
Tank And Valve--Part 1 Of 2--Type 1
Tank And Valve--Part 2 Of 2--Type 2
Tank And Valve--Part 1 Of 2
Tank And Valve--Part 2 Of 2
8m1071 Three Speed Planetary Transmission Group
| 8M***71 | Three Speed Planetary Torque Divider | 1 |
Three Speed Torque Divider Hydraulic Control
Throttle Control--As Viewed From Right Hand Side Of Truck--Part 1 Of 2
Throttle Control--As Viewed From Front Of Truck--Part 2 Of 2
3s118 Throttle Pressure And Converter Hold Valve Group
| 3S***18 | Throttle Pressure And Converter Hold Valve Group | 1 |
8m1012 Throttle Pressure Valve Group
| 8M***12 | Throttle Pressure Valve Group | 1 |
1t361 Torque Converter Group
| 1T***61 | Torque Converter Group | 1 |
Torque Converter Oil Cooler
Torque Divider
7m5845 Torque Divider Arrangement
| 7M***45 | Torque Divider Arrangement | 1 |
Transfer Gears
Transmission Control--As Viewed From Rear Of Truck -Part 2 Of 2
Transmission Control--As Viewed From Left Hand Side Of Truck- Part 1 Of 2
Transmission Control Linkage Guard
Transmission Hydraulic Control--End View -Part 2 Of 2
Transmission Hydraulic Control--Top View- Part 1 Of 2
Transmission Hydraulic Control--Top View -Part 1 Of 2
Transmission Lines--As Viewed From Rear Right Hand Side Of Truck--Part 1 Of 4
Transmission Lines--As Viewed From Rear Right Hand Side Of Truck--Part 4 Of 4
Transmission Lines--As Viewed From Rear Right Hand Side Of Truck--Part 2 Of 4
Transmission Lines--As Viewed From Rear Right Hand Side Of Truck--Part 3 Of 4
Transmission Pump And Lines--As Viewed From Rear Right Hand Side Of Truck--Part 3 Of 4
Transmission Pump And Lines--As Viewed From Rear Right Hand Side Of Truck--Part 1 Of 4
Transmission Pump And Lines--As Viewed From Rear Right Hand Side Of Truck--Part 2 Of 4
Transmission Pump And Lines--As Viewed From Rear Right Hand Side Of Truck--Part 4 Of 4
4h8461 Universal Joint Assembly
| 4H***61 | Universal Joint Assembly | 1 |
4d2287 Valve Assembly
| 4D***87 | Valve As; -Parking, Service | 1 |
5d3056 Double Check Valve Assembly
| 5D***56 | Valve As-Double Check; -Brakesaver Air Supply | 1 |
3d9943 Horn Valve
| 3D***43 | Valve As-Horn | 1 |
1s3998 Retarder Valve Assembly
| 1S***98 | Valve As-Retarder; -Operator Control | 1 |
4d1084 Brake Valve Assembly
| 4D***84 | Valve Group | 1 |
5j644 Relief Valve Group
| 5J***44 | Valve Group-Relief | 1 |
Windshield Wiper
769B serial number reference
The PIN plate is typically located on the machine frame or mast. The first three alphanumeric characters represent the serial number prefix, which identifies the model and manufacturing factory. For the 769B, this prefix helps distinguish it from the predecessor 769 and successor 769C.
| Prefix | Identifies | Notes |
|---|---|---|
| 99F | 769B | Serial prefix 99F is associated with the Caterpillar 769B off-highway truck. Production span for this model is generally cited as 1967 to 1978. Engine configuration for this specific serial range is not explicitly detailed in the provided documentation; verify exact engine type and build year with a dealer. |
Frequently asked questions
What engine powers the Caterpillar 769B?
The 769B is equipped with a Caterpillar D343 6-cylinder engine, providing 415 hp at 1900 rpm.
What is the operating weight of this truck?
The empty weight is approximately 60,759.4 lb (27,560 kg), with a loaded weight reaching 70,107 lb (31,800 kg).
What model replaced the 769B?
The 769B was succeeded by the 769C, which featured a redesigned platform and a different engine configuration.
What 769B owners discuss
What are the primary differences in cab construction and operator access between the original 769 and the 769B?
The original 769 featured a fiberglass cab that was prone to cracking. The 769B transitioned to a steel cab construction. Additionally, the 769B moved the entry point from the rear of the cab to a ladder located on the left front of the machine.
How does the engine performance and configuration differ in the 769B compared to the initial 769 model?
The 769B utilizes a Caterpillar D343T 6-cylinder turbocharged diesel engine. Power output increased by 15 horsepower over the original model, resulting in 415 flywheel horsepower.
What changes were made to the braking system and dump body on the 769B?
The 769B introduced a redesigned dump body featuring a 'V-floor' design; capacity remained at approximately 35 tons (23.5 cubic yards). While the original model only offered front axle brakes as an option, the 769B included brakes on both the front and rear axles as standard equipment.
What should be inspected when purchasing a used 769B to ensure long-term performance?
Thoroughly inspect the machine for abrasive wear, as abrasive materials can ruin a truck with weak components. Verify the condition of the dump body and ensure all structural elements are intact.
What is the risk of using generic hydraulic oil instead of Cat HYDO Advanced in this machine?
Using generic oils can cause additive packages to react chemically, creating sludge that clogs valves and damages pumps. Maintain cross-contamination below 10% when switching fluids.
What are the common indicators of engine or hydraulic failure in Caterpillar heavy machinery?
Operators should monitor for power loss, smoke, overheating, or slower hydraulic response. In hydraulic systems, loss of pressure, overheated oil, or jerky movement typically indicates internal leakage or contamination.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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