Caterpillarmotor grader
Caterpillar 140B
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 140B is a mid-size motor grader in the roughly 13.6-tonne (about 30,000 lb) operating-weight class, built around Caterpillar's own 3306 inline six-cylinder diesel, naturally aspirated and rated at approximately 150 hp (112 kW) gross. It carries a 13 ft (3.96 m) moldboard, a 6-speed-forward/4-speed-reverse power-shift transmission, oil-cooled multiple-disc brakes, and 14.0-24 tires as standard fitment. The 140B was built in the early-to-mid 1970s, following the original bare Cat 140 introduced around 1970 and preceding the Cat 140G that took over the line; exact start and end years for the 140B are not consistently documented across spec references, so treat this window as approximate. Buyers could spec the 140B with a front-mounted or rear ripper/scarifier attachment for breaking up hard-packed or frozen ground ahead of grading.
Across the wider 140-family lineage, Caterpillar moved from mechanically governed, naturally aspirated engines like the 140B's 3306 toward turbocharged and aftercooled powerplants, then to electronically controlled engines and transmissions in the 140G, 140H, 140K, and 140M generations, adding options such as articulated steering and joystick controls decades later. The 140B sits at the last purely mechanical, pre-electronic chapter of that lineage: no ECM, no diagnostic codes, and a drivetrain a competent diesel shop can rebuild without a factory laptop. That simplicity is why surviving 140B units still turn up in the used and parts market today: municipalities, ranches, and rural contractors buy them cheap for light grading and driveway work, while salvage yards break others for engine, transmission, and final-drive components shared with other 3306-powered Cat machines of the era.
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 140B specifications
Engine
| Engine model | Cat 3306 diesel, inline-6. One engine offering published across the 140B's production run — no documented mid-run engine change. |
| Power (rated) | 150.2 hp (112 kW). Spec sheets publish a single flywheel power figure; no separate gross/net split is documented for this model. |
| Displacement | 640.8-641 cu in (10.5 L / approx. 10,500 cc) |
| Cylinders | 6, inline |
| Emissions tier | Predates EPA Tier / EU Stage nonroad diesel emissions regulation. Mechanically governed diesel with no emissions certification applicable to its production era. |
Weights
| Operating weight (standard) | Approx. 30,000-30,030 lb (13,610-13,620 kg). Sources cluster tightly around 30,027 lb (13,620 kg); minor variance likely reflects rounding or tire/counterweight configuration. |
| Shipping weight | Not documented in publicly available spec sheets for this model — verify with dealer/service manual. |
| Ground pressure | Not published for this model. |
Dimensions
| Overall length (transport) | 26.5 ft (8.07-8.08 m) |
| Width over tires | 7.85-7.9 ft (2.39-2.41 m) |
| Height to top of cab | 10.5-10.6 ft (3.21-3.23 m) |
| Wheelbase | 20.15-20.2 ft (6.14-6.16 m) |
| Moldboard (blade) width | 13 ft (3.96 m) |
| Moldboard height | 27.6 in (70.1 cm) |
| Blade base | 9.06-9.1 ft (2.76-2.77 m) |
| Ground clearance | Not documented in publicly available spec sheets for this model. |
Performance
| Maximum forward travel speed | 23-23.4 mph (37-38 kph) |
| Maximum reverse travel speed | 16 mph (25.7-26 kph) |
| Transmission gears | 6 forward, 4 reverse |
| Turning radius | 38-38.1 ft (11.6-12 m) |
| Blade lift above ground | 14-14.1 in (35.6-36 cm) |
| Blade maximum reach outside tires | 94.5-95 in (240-241 cm) |
| Gradeability | Not published for this model. |
Service capacities (summary)
| Fuel tank | 60 gal (227 L) |
| Hydraulic system | Not documented in publicly available spec sheets for this model — verify with dealer/service manual. |
| Engine oil | Not documented in publicly available spec sheets for this model — verify with dealer/service manual. |
| Cooling system | Not documented in publicly available spec sheets for this model — verify with dealer/service manual. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
140B fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) — Cat 3306 diesel | Approx. 27–29 L (7.2–7.7 US gal), based on Cat 3306 engine service-refill data; the 140B-specific OMM figure is not published in available literature — confirm against the serial-specific manual. | Cat Diesel Engine Oil (DEO). SAE 30 in stable warm climates; SAE 10W-30 or 15W-40 multigrade where ambient temperature swings widely, per standard Cat engine-oil viscosity guidance for this engine class. |
| Cooling system | Not documented for the 140B specifically in available literature — verify against the serial-specific OMM. Comparable Cat 3306-powered graders of this era run in the low-to-mid 40s of liters (roughly 11-13 US gal). | Cat permanent-type antifreeze/coolant (pre-ELC era formulation), mixed to a 50/50 water ratio for standard freeze and corrosion protection; heavier concentration for extreme cold regions. |
| Fuel tank | 227 L (60 US gal). | No. 2-D diesel fuel. No. 1-D or a winter blend in cold climates to prevent fuel waxing/gelling. |
| Transmission (power-shift, direct-drive) | Not documented for the 140B specifically in available literature — verify against the serial-specific OMM. | Cat Transmission/Drive Train Oil (TDTO), TO-4 spec. SAE 10W as the standard multi-season grade; heavier viscosity in sustained hot conditions, per the Cat TO-4 viscosity chart. |
| Circle drive housing | Not documented for the 140B specifically in available literature — verify against the serial-specific OMM. | Cat TDTO (TO-4 spec) where the OMM specifies a shared powertrain lubricant; a heavier-viscosity gear lubricant if the OMM calls out the circle drive as a separate fill point. |
| Final drives / tandem drive housings (each) | Not documented for the 140B specifically in available literature — verify against the serial-specific OMM. | Cat TDTO (TO-4 spec), same family as the transmission fill unless the OMM calls for a straight gear oil. |
| Hydraulic system and tank | Not documented for the 140B specifically in available literature — verify against the serial-specific OMM. | Cat TDTO (TO-4 spec) on machines where hydraulic and powertrain oil are a shared system, or Cat Hydraulic Oil (AW/HYDO type) if the OMM specifies a dedicated hydraulic fill — check the OMM to confirm which applies to this serial range. |
| Grease (spec only) | Not applicable — lubricated per grease-point interval, not a bulk refill. | Cat Multipurpose Grease, NLGI 2, lithium-complex base with EP/moly fortification for heavily loaded pivot pins and bushings. Effective range roughly -30 to 40 C (-22 to 104 F); switch to an arctic-grade grease in sustained sub-zero climates. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 140B maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 6,000 h |
|
Servicing the 140B beyond the schedule
Predictive Maintenance & Fluid Analysis
The 140B's mechanically governed 3306 diesel has no ECM, so there are no fault codes to warn of wear. Pull oil samples from the engine, power-shift transmission/torque converter, and tandem final drives on a regular cycle; rising iron or copper readings flag circle gear, bearing, or clutch-pack wear before it causes a breakdown. Test coolant conditioner concentration to protect the wet-sleeve cylinder liners from cavitation erosion, and track fuel consumption drift as an early sign of injector or governor wear.
Corrective & Common Repairs
Expect wear at the circle wear shoes and gear teeth, the drawbar center ball-and-socket, and the moldboard slide rails; these are the parts that carry the daily grading load. Blade lift and tilt cylinder seals leak as the machine ages, and the oil-cooled multi-disc brakes and power-shift clutch packs need periodic adjustment or rebuild. On a machine this old, check the fuel tank, lines, and injection pump for rust and contamination before assuming a performance problem is mechanical.
Overhaul & Rebuild Points
Major overhaul targets on the 140B are the torque converter and power-shift clutch packs, the tandem final-drive housings and planetary gear sets, and the circle drive gearbox and wear ring. Check the main frame, drawbar, and circle pin bores for elongation or cracking after decades of grading loads. Engine overhaul addresses cylinder liner and ring wear along with the injection pump, since the naturally aspirated 3306 has no turbocharger to service.
Seasonal & Environment Servicing
In cold climates, verify starting aids before winter, match engine and hydraulic oil viscosity to ambient temperature, and check coolant antifreeze concentration each fall on this naturally aspirated 3306. On hot, dusty jobsites, service the air cleaner element more often and watch tandem and final-drive oil for dust ingress. On wet or muddy sites, grease the drawbar ball-socket and circle more frequently since mud displaces lubricant faster, and check front wheel bearing seals for water intrusion after wash-down.
140B common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 2Y-8670 | Filter As-Fuel | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
140B attachments & work tools
Front-mounted work tools (scarifier, blade)
A nose-mounted front lift group is the common mounting point for front work tools on this grader class. A front scarifier hooks to the lift group for light-duty ripping of compacted subgrade, asphalt, or rocky material ahead of the moldboard pass. A straight front blade can be fitted for light dozing or snow work, sized to the machine's roughly 4 m (13 ft) blade class.
Rear ripper
A hydraulic rear-mounted ripper frame carries straight shanks and teeth behind the tandem for breaking hard ground, frost, or old pavement ahead of grading. It runs off its own hydraulic circuit for shank lift and cross-shift, separate from the moldboard controls.
Snow removal attachments
Mast-type snow wings are used for throwing deep drifted snow; mastless wings clear and bench drifted snow along shoulders and can ramp up to a steep bench angle. A front-mounted straight blade or V-plow, carried on the nose lift group, is the alternative for lighter snow or berm work.
Moldboard extension
A bolt-on moldboard extension adds roughly 600 mm (24 in) of reach to the standard blade for wider single-pass coverage, matching the machine's base moldboard width of about 4 m (13 ft).
Push block / counterweight
A push block mounts to the nose plate, ahead of the radiator, to counterbalance a rear ripper and give the grader a push point when used as a push vehicle for scraper or dozer support work.
Ground engaging tools - cutting edges and end bits
Through-hardened moldboard cutting edges and end bits are the standard wear items protecting the blade and its ends; carbide or insert-style edges are the upgrade path for higher-speed or more abrasive grading and snow work. These are common consumables across this grader size class rather than model-specific parts.
Mounting / coupler system
Front tools bolt or pin to the nose-mounted front lift group bracket; the rear ripper mounts to its own drawbar-style shank frame at the tandem. This class of grader uses bolted/pinned mechanical attachment points, not a hydraulic quick-coupler system like a loader or excavator, so tool changes are a shop task rather than an in-field swap.
Hydraulic kit / arrangement notes
Front-mounted tools (scarifier, blade, snow wing) draw lift and tilt function from the machine's hydraulic system through the front lift group's cylinders. The rear ripper needs its own hydraulic tie-in for shank lift and shift, typically routed through an added rear valve section; a front lift group and its hydraulic lines are prerequisites before any front tool can be fitted.
Operator station / guarding options
An open ROPS canopy or an enclosed cab station were the typical factory/dealer operator-station options for this grader class; screens or guards over the radiator and hydraulic lines are a common aftermarket add for quarry or aggregate duty. Exact operator-station and guarding offerings vary by configuration and build year - verify against the specific unit's build sheet.
All 140B assemblies by section
Every catalogued assembly group for the Caterpillar 140B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
7n3884 Air Lines Gp
| 7N***84 | Air Lines Group | 1 |
7s3605 Air Cleaner Group
| 7S***05 | Air Cleaner Group | 1 |
4n9586 Fastener Gp-Exhaust Manifold
| 4N***86 | Fastener Group-Exhaust Manifold; Exhaust Manifold Fastener Group | 1 |
2p8172 Housing & Regulator Gp
| 2P***72 | Housing & Regulator Group; Regulator And Housing Group | 1 |
7n3883 Lines Gp-Air
| 7N***83 | Lines Group-Air; Air Lines Group | 1 |
2y6493 Turbocharger Oil Lines Group
| 2Y***93 | Lines Group-Turbocharger Oil; Turbocharger Oil Lines Group | 1 |
6n0164 Exhaust Manifold Group
| 6N***64 | Manifold Group-Exhaust | 1 |
8s1335 Muffler Group
| 8S***35 | Muffler Group; Muffler Gp-Exhaust | 1 |
4n8970 Turbocharger Group
| 4N***70 | Turbocharger Group | 1 |
4n8969 Turbocharger Group*R
| 4N***69 | Turbocharger Group | 1 |
Basic Engine
1n4406 Camshaft Group
| 1N***06 | Camshaft Group-Single; Camshaft Group--Single | 1 |
2y5174 Cylinder Block Cover Group
| 2Y***74 | Cover Group-Cylinder Block | 1 |
2p6530 Cylinder Head Cover Group
| 2P***30 | Cover Group-Cylinder Head; Cylinder Head Cover Group | 1 |
2y5248 Front Housing Cover Group
| 2Y***48 | Cover Group-Front Housing; Front Housing Cover Group | 1 |
2p6516 Valve Mechanism Cover Group
| 2P***16 | Cover Group-Valve Mechanism; Valve Mechanism Cover Group | 1 |
Crankshaft Bearing Replacements
| 8N***25 | Bearing (1.25mm Undersize) | 7 |
| 8N***26 | Bearing (0.51mm Undersize) | 7 |
| 8N***27 | Bearing (0.76mm Undersize) | 7 |
2y5206 Crankshaft Gp
| 2Y***06 | Crankshaft Group; Crankshaft Group | 1 |
2y5235 Cylinder Block As
| 2Y***35 | Cylinder Block As | 1 |
7n6550 Cylinder Block As
| 7N***50 | Cylinder Block As | 1 |
2y9363 Cylinder Block Gp
| 2Y***63 | Cylinder Block Group | 1 |
1n3576 Cylinder Block Gp
| 1N***76 | Cylinder Block Group | 1 |
8n3021 Cylinder Block Gp
| 8N***21 | Cylinder Block Group; Cylinder Block Group | 1 |
2y9362 Cylinder Head Gp
| 2Y***62 | Cylinder Head Group | 1 |
2p6486 Cylinder Head Gp
| 2P***86 | Cylinder Head Group; Cylinder Head Group | 1 |
2p7838 Damper Group
| 2P***38 | Damper Group; Damper Group | 1 |
2p7831 Fan Drive Group
| 2P***31 | Drive Group-Fan; Fan Drive Group | 1 |
2y9486 Engine Ar-Pat 2 Of 2
| 2P***26 | Valve-Mechanism Group; Valve Mechanism Group | 1 |
| 2P***37 | Pump Group-Oil; Engine Oil Pump Group | 1 |
| 2P***61 | Lines Group-Engine Oil; Engine Oil Lines Group | 1 |
2y9486 Engine Ar-Part 1 Of 2
| 1N***06 | Camshaft Group-Single; Camshaft Group--Single | 1 |
| 1P***44 | Breather Group | 1 |
| 2P***29 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
7n9536 Fastener Gp-Cylinder Head
| 7N***36 | Fastener Group-Cylinder Head; Cylindetr Head Fastener Group | 1 |
5y0376 Fastener Gp-Cylinder Head
| 5Y***76 | Fastener Group-Cylinder Head | 1 |
2p6546 Fastener Gp-Cylinder Head
| 2P***46 | Fastener Group-Cylinder Head; Cylinder Head Fastener Group | 1 |
2y5717 Front Housing Fastener Group
| 2Y***17 | Fastener Group-Front Housing; Front Housing Fastener Group | 1 |
5s3451 Flywheel Group
| 5S***51 | Flywheel Group; Flywheel Group | 1 |
2y5707 Front Timing Gear Group
| 2Y***07 | Gear Group-Front; Gear Gp-Front Timing | 1 |
2p6129 Flywheel Housing Group
| 2P***29 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
2y8429 Housing Gp-Front
| 2Y***29 | Housing Group-Front | 1 |
2y5250 Housing Gp-Front
| 2Y***50 | Housing Group-Front; Front Housing Group | 1 |
6n8336 Lifting Eye Gp-Engine
| 6N***36 | Lifting Group; Lifting Eye Gp-Engine | 1 |
2y5347 Lifting Eye Gp-Engine
| 2Y***47 | Lifting Group; Lifting Eye Gp-Engine | 1 |
2s6981 Parts Gp-Miscellaneous
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 1A***37 | Bolt Clutch Assembly To Bracket (Fan Support) | 4 |
| 1D***17 | Nut-Plate And Angle Assembly To Hydraulic And Fuel Tanks; Nut Plate And Angle Assembly To Hydraulic And Fuel Tanks | 1 |
9s8912 Connecting Rod And Piston Group-6 Required
| 9S***12 | Piston & Rod Group; Connecting Rod And Piston Group | 1 |
2y2943 Pulley Group
| 2Y***43 | Pulley Group; Pulley Group | 1 |
6n0220 Crankshaft Seal Group
| 6N***20 | Seal Group-Crankshaft | 1 |
2p7751 Engine Support Group
| 2P***51 | Support Group-Engine; Engine Support Group | 1 |
7n9589 Trunnion Group
| 7N***89 | Trunnion Group-Engine | 1 |
2p6526 Valve Mechanism Gp
| 2P***26 | Valve-Mechanism Group; Valve Mechanism Group | 1 |
Blade Controls, Hydraulic/Steering System
2g9945 Blade Arrangement
| 2D***00 | Centershift Group; Centershift Group | 1 |
| 2G***10 | Circle Group; Circle Group | 1 |
| 2G***75 | Lift Group-Blade; Blade Lift Group | 1 |
1g1305 Power Control Group-Side View-Part 2 Of 3
| 1G***05 | Control Group-Power | 1 |
1g1305 Power Control Group-Front View-Part 1 Of 3
| 1G***05 | Control Group-Power | 1 |
1g1305 Power Control Group-Front View
| 1G***05 | Control Group-Power | 1 |
1g1305 Power Control Group-Side View
| 1G***05 | Control Group-Power | 1 |
1g1305 Control Gp-Power-Side View- Part 3 Of 3
| 1G***05 | Control Group-Power | 1 |
6g0070 Steering Control Group-Part 1
| 6G***70 | Control Group-Steering | 1 |
6g0070 Steering Control Group-Part 2
| 6G***70 | Control Group-Steering | 1 |
2y8488 Cylinder Gp-Blade Side Shift
| 2Y***88 | Cylinder Group | 1 |
6g4415 Blade Side Shift Cylinder Group
| 6G***15 | Cylinder Group | 1 |
3g5189 Cylinder Group-127 Mm (5 In.) Bore X 495 Mm (19 In.) Stroke
| 3G***89 | Cylinder Group-Ripper Lift; Ripper Lift Cylinder Group | 1 |
4j4115 Steering Cylinder Group-100 Mm (4 In.) Bore X 150 Mm (6 In.) Stroke
| 4J***15 | Cylinder Group-Steer | 1 |
2g9995 Drive Gp-Circle-Part 2 Of 2
| 2G***95 | Drive Group-Circle; Circle Drive Group | 1 |
2g9995 Drive Gp-Circle-Part 1 Of 2
| 2G***95 | Drive Group-Circle; Circle Drive Group | 1 |
2g9995 Circle Drive Group-Part 2 Of 2
| 2G***95 | Drive Group-Circle; Circle Drive Group | 1 |
2g9995 Circle Drive Group-Part 1 Of 2
| 2G***95 | Drive Group-Circle; Circle Drive Group | 1 |
2y4314 Power Control Drive Shaft Group
| 2Y***14 | Drive Shaft Group-Power Control | 1 |
2d2150 Filter Gp
| 2D***50 | Filter Group | 1 |
2y5396 Joint As
| 2Y***96 | Joint As | 1 |
2y1523 Joint Assembly
| 2Y***23 | Joint As | 1 |
2y5394 Joint As
| 2Y***94 | Joint As | 1 |
2y7207 Joint As-Universal
| 2Y***07 | Joint As | 1 |
2y7205 Joint As-Universal
| 2Y***05 | Joint As | 1 |
2g9775 Blade Lift Group-Part 1
| 2G***75 | Lift Group-Blade; Blade Lift Group | 1 |
2g9775 Blade Lift Group-Part 2
| 2G***75 | Lift Group-Blade; Blade Lift Group | 1 |
3g7048 Lines & Valve Gp-Ripper-Part 1 Of 2
| 3G***48 | Lines & Valve Group; Ripper Lines Group | 1 |
3g7048 Lines & Valve Gp-Ripper-Part 2 Of 2
| 3G***48 | Lines & Valve Group; Ripper Lines Group | 1 |
6g0065 Blade Side Shift Lines Group-Part 1
| 6G***65 | Lines Group-Blade Side Shift; Blade Side Shift Lines Group | 1 |
6g0065 Blade Side Shift Lines Group-Part 2
| 6G***65 | Lines Group-Blade Side Shift; Blade Side Shift Lines Group | 1 |
6g0055 Hydraulic Pump, Tank And Valve Group-Part 1 Of 2
| 6G***55 | Pump & Valve Group | 1 |
6g0055 Hydraulic Pump, Tank And Valve Group-Part 2 Of 2
| 6G***55 | Pump & Valve Group | 1 |
6g0055 Hydraulic Pump, Tank And Valve Group - Part 2 Of 2
| 6G***55 | Pump & Valve Group | 1 |
6g0055 Hydraulic Pump, Tank And Valve Group - Part 1 Of 2
| 6G***55 | Pump & Valve Group | 1 |
3g9801 Metering Pump Group
| 3G***01 | Pump Group-Metering | 1 |
3g6909 Vane Pump Group
| 3G***09 | Pump Group-Vane | 1 |
4b8580 Shaft Gp-Control
| 4B***80 | Shaft Group-Control; Control Shaft Group | 1 |
4b8580 Control Shaft Group
| 4B***80 | Shaft Group-Control; Control Shaft Group | 1 |
2g9946 Shaft Gp-Leaning Wheel Control
| 2G***46 | Shaft Group-Leaning Wheel Control | 1 |
2g9946 Leaning Wheel Control Shaft Group
| 2G***46 | Shaft Group-Leaning Wheel Control | 1 |
6g0460 Hydraulic Tank Group
| 6G***60 | Tank Group | 1 |
8d1567 Joint Assembly
| 8D***67 | Universal Joint As | 1 |
8d1502 Joint Assembly
| 8D***02 | Universal Joint Group | 1 |
8d1566 Joint Assembly
| 8D***66 | Universal Joint Group | 1 |
8d1505 Joint Assembly
| 8D***05 | Universal Joint Group | 1 |
3g6935 Bank Valve Gp-2 Valve
| 3G***35 | Valve Group | 1 |
3g8684 Valve Gp-Control
| 3G***84 | Valve Group-Control | 1 |
3g8682 Control Valve Group
| 3G***82 | Valve Group-Control | 1 |
3g6934 Control Valve Group
| 3G***34 | Valve Group-Control | 1 |
3g8657 Valve Group
| 3G***57 | Valve Group-Relief | 1 |
3g8680 Relief Valve Group
| 3G***80 | Valve Group-Relief | 1 |
Brakes
4b8759 Cylinder Brake Assembly
| 4B***59 | Brake As-Cylinder | 1 |
1g2298 Brake Assembly-L.H.
| 1G***98 | Brake As-Lh | 1 |
1g2299 Brake Assembly-R.H.
| 1G***99 | Brake As-Rh | 1 |
3d9200 Brake Gp-Hydraulic Rear Wheel
| 3D***00 | Brake Group-Hydraulic | 1 |
2g9920 Clutch And Brake Control Group-Front View
| 2G***20 | Control Group-Brake & Clutch | 1 |
2g9920 Clutch And Brake Control Group-Side View
| 2G***20 | Control Group-Brake & Clutch | 1 |
7d5648 Master Cylinder Assembly
| 7D***48 | Cylinder As-Master | 1 |
6d0689 Power Cylinder Assembly
| 6D***89 | Cylinder As-Power | 1 |
7d5649 Master Power Cylinder Assembly
| 7D***49 | Cylinder As-Power Master | 1 |
2y5565 Brake Lever Assembly
| 2Y***65 | Lever As-Brake | 1 |
6g0060 Service Brake Lines Group
| 6G***60 | Lines Group-Service Brake | 1 |
Cab, Gauges And Accessories
2y2000 Cab Door Group
| 2Y***00 | Cab Door Group | 1 |
2y1270 Cab Group
| 2Y***70 | Cab Group | 1 |
2y2020 Cab Group - Closed
| 0T***42 | Bolt | 5 |
| 2D***34 | Glass (Untinted) | 2 |
| 2P***52 | Spring | 2 |
2y2282 Compressor Group
| 2Y***82 | Compressor Group-Air | 1 |
2y1982 Door Gp-Lh
| 2Y***82 | Door Group-Lh | 1 |
2y1981 Door Gp-Rh
| 2Y***81 | Door Group-Rh | 1 |
8d8175 Gauge Gp
| 8D***75 | Gauge Group | 1 |
2y7633 Gauge Gp
| 2Y***33 | Gauge Group | 1 |
2y6835 Gauge Gp
| 2Y***35 | Gauge Group | 1 |
1g1553 Seat Frame, Fuel Tank And Platform Group-Side View
| 1G***53 | Platform Group | 1 |
1g1553 Seat Frame, Fuel Tank And Platform Group-Top View
| 1G***53 | Platform Group | 1 |
2y5468 Seat Belt Gp
| 2Y***68 | Seat Belt Group | 1 |
2y2232 Seat Frame Assembly
| 2Y***32 | Seat Frame As | 1 |
6g2090 Seat Group
| 6G***90 | Seat Group | 1 |
2y2235 Tire Pump Group
| 2Y***35 | Tire Pump Group | 1 |
6g1370 Tool Box Group
| 6G***70 | Tool Box Group; Tool Box Group | 1 |
2y1995 Windshield Group
| 2Y***95 | Windshield Group | 1 |
Chassis
2g9810 Front Axle Group-Top View
| 2G***10 | Axle Group-Front | 1 |
2g9810 Front Axle Group-Section View
| 2G***10 | Axle Group-Front | 1 |
6g0050 Push Block Group
| 6G***50 | Block Group-Push | 1 |
3d2329 Hub Cap Group
| 3D***29 | Cap Group-Hub | 1 |
2d6400 Centershift Group
| 2D***00 | Centershift Group; Centershift Group | 1 |
2g0010 Circle Group
| 2G***10 | Circle Group; Circle Group | 1 |
2g9990 Drawbar Group
| 2G***90 | Drawbar Group; Drawbar Group | 1 |
2g0015 Frame Group-Part 1
| 2G***15 | Frame Group | 1 |
2g0015 Frame Group-Part 2
| 2G***15 | Frame Group | 1 |
2g9885 Hood Group
| 2G***85 | Hood Group | 1 |
6d4430 Radiator Support Group
| 6D***30 | Support Group-Radiator | 1 |
2g9985 Front Wheel And Tire Group
| 2G***85 | Wheel & Tire Group-Front | 1 |
Cooling System
8n4457 Base Gp-Oil Filter
| 8N***57 | Base Group-Oil Filter; Base Group-Engine Oil Filter | 1 |
8n4457 Base Gp-Engine Oil Filter
| 8N***57 | Base Group-Oil Filter; Base Group-Engine Oil Filter | 1 |
2p6215 Cooler Gp-Engine Oil
| 2P***15 | Cooler Group-Engine Oil; Oil Cooler Group Engine | 1 |
2y8054 Cooler Gp-Filter Base & Engine Oil
| 2Y***54 | Cooler Group-Filter & Engine Oil | 1 |
2y8053 Cooler Gp-Filter Base & Engine Oil
| 2Y***53 | Cooler Group-Filter Base & Eng Oil; Cooler Gp-Filter Base & Engine Oil | 1 |
2w6954 Cooler Gp-Filter Base & Engine Oil
| 2W***54 | Cooler Group-Filter Base & Eng Oil | 1 |
2w6953 Cooler Gp-Filter Base & Engine Oil
| 2W***53 | Cooler Group-Filter Base & Eng Oil | 1 |
7s3739 Blower Fan And Guard Group
| 7S***39 | Fan Group-Blower | 1 |
8n4112 Lines Gp-Water
| 8N***12 | Lines Group-Water; -Bypass Relief | 1 |
2p7740 Lines Gp-Water-Elbow
| 2P***40 | Lines Group-Water; Water Lines Group--Elbow | 1 |
2y8079 Lines Gp-Water
| 2Y***79 | Lines Group-Water; Water Lines Group | 1 |
7n7211 Lines Gp-Water
| 7N***11 | Lines Group-Water; Water Lines Group | 1 |
2w8001 Pump Gp-Water*R
| 2W***01 | Pump Group-Water | 1 |
7n5909 Pump Gp-Water
| 7N***09 | Pump Group-Water; Water Pump Group | 1 |
7n5909 Water Pump Group
| 7N***09 | Pump Group-Water; Water Pump Group | 1 |
7n7220 Radiator Group-Rear View
| 7N***20 | Radiator Group | 1 |
7n7220 Radiator Group-Side View
| 7N***20 | Radiator Group | 1 |
Engine Arrangement
2y6299 Engine Ar-Part 1 Of 2
| 1N***06 | Camshaft Group-Single; Camshaft Group--Single | 1 |
| 2P***29 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
| 2P***99 | Fastener Group-Oil Pan; Oil Pan Fastener Group | 1 |
2y6299 Engine Ar-Part 2 Of 2
| 1P***44 | Breather Group | 1 |
| 2P***15 | Cooler Group-Engine Oil; Oil Cooler Group Engine | 1 |
| 2P***75 | Filter Group-Engine Oil; Oil Filter Group (10z1 ~ 10z7023) | 1 |
Fuel System And Governor
2y5993 Control Gp-Governor
| 2Y***93 | Control Group-Governor | 1 |
2y9252 Cover As
| 2Y***52 | Cover As | 1 |
2y6115 Cover Gp-Governor
| 2Y***15 | Cover Group-Governor | 1 |
2y8982 Cover Gp-Governor & Detent
| 2Y***82 | Cover Group-Governor & Detent | 1 |
2y8670 Filter As-Fuel
| 2Y***70 | Filter As-Fuel | 1 |
2y5711 Filter Gp-Fuel
| 2Y***11 | Filter Group-Fuel; Fuel Filter Group | 1 |
2y6518 Flyweight Gp
| 2Y***18 | Flyweight Group | 1 |
2y8980 Flyweight Gp
| 2Y***80 | Flyweight Group | 1 |
2y9001 Governor Gp-Part 1 Of 2
| 2Y***01 | Governor Group | 1 |
2y6477 Governor Gp-Part 2 Of 2
| 2Y***77 | Governor Group | 1 |
2y9001 Governor Gp-Part 2 Of 2
| 2Y***01 | Governor Group | 1 |
5y1147 Governor Gp-Part 2 Of 2
| 5Y***47 | Governor Group | 1 |
5y1147 Governor Gp-Part 1 Of 2
| 5Y***47 | Governor Group | 1 |
2y6477 Governor Gp-Part 1 Of 2
| 2Y***77 | Governor Group | 1 |
2y5709 Fuel Injection Lines Group
| 2Y***09 | Lines Group | 1 |
2y5907 Lines Gp-Fuel
| 2Y***07 | Lines Group-Fuel | 1 |
2y6279 Lines Gp-Fuel Injection
| 2Y***79 | Lines Group-Fuel Injection; Fuel Injection Lines Group | 1 |
2y5712 Lines Gp-Injection Pump Lube Oil
| 2Y***12 | Lines Group-Lube Oil; Injection Pump Lubrication Oil Lines Grp | 1 |
2y5787 Pump Gp-Fuel Transfer
| 2Y***87 | Pump Group-Fuel Transfer | 1 |
2y9002 Governor & Fuel Injection Pump Gp
| 2Y***02 | Pump Group-Gov & Fuel Inj; Governor & Fuel Injection Pump Gp | 1 |
2y6470 Governor & Fuel Injection Pump Gp-Part 1 Of 2
| 2Y***70 | Pump Group-Gov & Fuel Inj; Pump Gp-Governor & Fuel Injection | 1 |
2y6470 Governor & Fuel Injection Pump Gp-Part 2 Of 2
| 2Y***70 | Pump Group-Gov & Fuel Inj; Pump Gp-Governor & Fuel Injection | 1 |
2y6285 Governor & Fuel Injection Pump Gp
| 2Y***85 | Pump Group-Gov & Fuel Inj; Governor & Fuel Injection Pump Group | 1 |
5y1146 Governor, Fuel Injection & Fuel Transfer Pump Gp
| 5Y***46 | Pump Group-Gov, Fuel Inj & Tfr; Governor & Fuel Injection Pump Gp | 1 |
2y6358 Rack Setting Gp
| 2Y***58 | Rack Setting Group | 1 |
2y6485 Rack Setting Gp
| 2Y***85 | Rack Setting Group | 1 |
2y9250 Setting Gp
| 2Y***50 | Setting Group | 1 |
Implements
2y6909 Blade Extension Group - L.H.
| 2Y***09 | Blade Extension Group-Lh | 1 |
2g9944 Blade Group-Type 2
| 2G***44 | Blade Group; Blade Group | 1 |
2g9944 Blade Group - Type 1
| 2G***44 | Blade Group; Blade Group | 1 |
2g9944 Blade Gp
| 2G***44 | Blade Group; Blade Group | 1 |
2y6908 Blade Extension Group - R.H.
| 2Y***08 | Blade Group | 1 |
8w3331 Extension Gp-Blade-R.H.
| 8W***31 | Extension Group-Blade | 1 |
8w3333 Extension Gp-Blade-L.H.
| 8W***33 | Extension Group-Blade | 1 |
3g6945 Ripper Mounting Group
| 3G***45 | Mounting Group-Ripper; Ripper Mounting Group | 1 |
3g6605 Ripper Arrangement
| 2Y***62 | Film | 1 |
| 2Y***90 | Plate-Serial Number; (Bulldozer) | 1 |
| 3G***89 | Cylinder Group-Ripper Lift; Ripper Lift Cylinder Group | 1 |
3g7706 Ripper Arrangement
| 3G***06 | Ripper Ar; Ripper Arrangement--Basic | 1 |
3g6953 Ripper Gp
| 3G***53 | Ripper Group | 1 |
6g0930 Scarifier Gp-Mechanical-Part 2 Of 3
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Group- V-Type - Part 2 Of 3 - Type 1
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Group - V-Type - Part 1 Of 3 - Type 1
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Group-V-Type-Part 2 Of 3 - Type 2
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Group - V-Type - Part 3 Of 3-Type 2
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Gp-Mechanical-Part 1 Of 3
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Group-V-Type-Part 1 Of 3 - Type 2
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Gp-Mechanical-Part 3 Of 3
| 6G***30 | Scarifier Group-Mechanical | 1 |
6g0930 Scarifier Group-V-Type - Part 3 Of 3 - Type 1
| 6G***30 | Scarifier Group-Mechanical | 1 |
5y0397 Tooth Gp
| 5Y***97 | Tooth Group | 1 |
8j1434 Tooth Gp-Ripper
| 8J***34 | Tooth Group-Scarifier; -Straight | 1 |
4k3330 Tooth Group
| 4K***30 | Tooth Group-Scarifier | 1 |
7d6218 Frame Weight Group
| 7D***18 | Weight Group-Frame | 1 |
Lubrication System
1p4244 Breather Group
| 1P***44 | Breather Group | 1 |
2p6199 Oil Pan Fastener Group
| 2P***99 | Fastener Group-Oil Pan; Oil Pan Fastener Group | 1 |
2p6855 Oil Filler Group
| 2P***55 | Filler Group-Oil | 1 |
2p6475 Filter Gp-Engine Oil
| 2P***75 | Filter Group-Engine Oil; Oil Filter Group (10z1 ~ 10z7023) | 1 |
2y6278 Fumes Disposal Group
| 2Y***78 | Fumes Disposal Group; Fumes Disposal Group | 1 |
2y8416 Gauge Gp-Oil Level (Dipstick)
| 2Y***16 | Gauge Group-Oil Level (Dipstick) | 1 |
2p6493 Gauge Gp-Oil Level (Dipstick)
| 2P***93 | Gauge Group-Oil Level (Dipstick); -Engine | 1 |
2p6861 Lines Gp-Engine Oil
| 2P***61 | Lines Group-Engine Oil; Engine Oil Lines Group | 1 |
2y5231 Oil Pan Group
| 2Y***31 | Pan Group-Oil | 1 |
2p7830 Gear Pump Group
| 2P***30 | Pump Group-Gear | 1 |
2p6537 Oil Pump Group
| 2P***37 | Pump Group-Oil; Engine Oil Pump Group | 1 |
Power Train-Power Transmission Unit
7d9030 Rear Axle Group
| 7D***30 | Axle Group-Rear | 1 |
4d2150 Transmission Brake Group
| 4D***50 | Brake Group-Transmission | 1 |
5d3400 Transmission Case And Covers Group-Side View
| 5D***00 | Case & Covers Group-Tmsn | 1 |
5d3400 Transmission Case And Covers Group-End View
| 5D***00 | Case & Covers Group-Tmsn | 1 |
2y6820 Flywheel Clutch Group
| 2Y***20 | Clutch Group-Flywheel | 1 |
2g0020 Tandem Drive Group-Part 2
| 2G***20 | Drive Group-Tandem | 1 |
2g0020 Tandem Drive Group-Part 1
| 2G***20 | Drive Group-Tandem | 1 |
7d5460 Oil Filter Group
| 7D***60 | Filter Group-Oil | 1 |
7d9550 Transmission Lubrication System Group
| 7D***50 | Lubrication Group-Transmission | 1 |
4d2790 Gear Shift Group-Part 2
| 4D***90 | Shift Group-Gear | 1 |
2g9750 Transmission Group-Side View
| 2G***50 | Transmission Ar | 1 |
2g9750 Transmission Group-Top View
| 2G***50 | Transmission Ar | 1 |
2g9980 Rear Wheel And Tire Group-1.400 X 24 Tube Type Tire
| 2G***80 | Wheel & Tire Group-Rear | 1 |
Schematic
Power Train Schematic
Service Equipment And Supplies
Gasket Kits
| 5P***68 | Kit-Gasket; (Single Cylinder Liner)(Single Cylinder Liner) | 0 |
| 5P***98 | Water Pump (Effective With Serial No. 44v22485~44v23615); Water Pump (Effective With Serial No. 43v18854~43v20046) | 0 |
| 6V***00 | Turbocharger Mounting | 0 |
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
Name Plates And Transfers
| 1G***08 | Plate-Instruction-On Instrument Panel | 1 |
| 1G***47 | Plate-Gearshift-Under Instrument Panel | 1 |
| 1M***63 | Plate-Heat-Start Switch Instructions; On Instrument Panel | 1 |
2y2576 Tool Group - Type 2
| 2Y***76 | Tool Group-Hand | 1 |
2y2576 Tool Group - Type 1
| 2Y***76 | Tool Group-Hand | 1 |
Starting And Electrical System
2y8310 Alternator Gp
| 2Y***10 | Alternator Group-Charging | 1 |
2y4212 Alternator Group
| 2Y***12 | Alternator Group-Charging | 1 |
2y2935 Alternator Gp
| 2Y***35 | Alternator Group-Charging | 1 |
2y8945 Alternator Gp
| 2Y***45 | Alternator Group-Charging | 1 |
2y1955 Battery & Wiring Gp-Part 2 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery And Wiring Gpoup-24 Volt-Part 1 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery And Wiring Gp-24 Volt-Part 3 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery And Wiring Gp-24 Volt-Part 5 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery And Wiring Gp-24 Volt-Part 2 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery & Wiring Gp-Part 5 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery & Wiring Gp-Part 3 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery And Wiring Gp-24 Volt-Part 4 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery & Wiring Gp-Part 1 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery & Wiring Gp-Part 4 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
2y1955 Battery And Wiring Gp-24 Volt-Part 1 Of 5
| 2Y***55 | Battery & Wiring Group | 1 |
5s8501 Glow Plug Group
| 5S***01 | Glow Plug Group; Glow Plug And Wiring Group | 1 |
2y2074 Harness As
| 2Y***74 | Harness As | 1 |
7m7147 Combination Stop And Tail Lamp Assembly-24 Volt-Type 2
| 7M***47 | Lamp As-Stop & Tail | 1 |
7m7147 Combination Stop And Tail Lamp Assembly-24 Volt-Type 1
| 7M***47 | Lamp As-Stop & Tail | 1 |
1m3387 Dash Lamp As-24 Volt
| 1M***87 | Lamp Group | 1 |
1m6052 Head Lamp Assembly-24 Volt
| 1M***52 | Lamp Group | 1 |
2y4477 Flood Lamp Group - 24 Volt
| 2Y***77 | Lamp Group-Flood | 1 |
2y5112 Flood Lamp Group-Front-24 Volt
| 2Y***12 | Lamp Group-Flood-Front | 1 |
2y1780 Lamp Gp-Head
| 2Y***80 | Lamp Group-Head | 1 |
2y1790 Head Lamp Group-24 Volt-Without Cab-Rear
| 2Y***90 | Lamp Group-Head | 1 |
2y4288 Head Lamp Group-24 Volt-Rear
| 2Y***88 | Lamp Group-Head | 1 |
2y1780 Head Lamp Group-24 Volt
| 2Y***80 | Lamp Group-Head | 1 |
2y2930 Regulator Assembly
| 2Y***30 | Regulator As; (Separate Illustration) | 1 |
2y1921 Starting Motor Gp-Electric
| 2Y***21 | Starting Motor Group-Electric | 1 |
2y1920 Electric Starting Motor Group-24 Volt
| 2Y***20 | Starting Motor Group-Electric | 1 |
7n0718 Switch As-Disconnect
| 7N***18 | Switch As-Disconnect; -Battery-Ground Level | 1 |
2y8441 Switch As-Disconnect
| 2Y***41 | Switch As-Disconnect | 1 |
7n4160 Switch Gp
| 7N***60 | Switch Group | 1 |
140B serial number reference
On the 140B the PIN/serial plate sits on the right-hand main frame rail near the front of the machine. This right-side front-frame placement is the standard location used across the 140-series grader lineage of this era. A few vintage Cat graders also carry a second stamped tag elsewhere on the frame, so check both sides if the primary plate is missing or unreadable. Read the first three characters as the serial number prefix, which ties to the model and build series; the digits that follow are the unit sequence number within that prefix.
| Prefix | Identifies | Notes |
|---|---|---|
| 61S | Caterpillar 140B motor grader, full production run | Dealer parts catalog covers 61S1 through last unit built, indicating this is the sole PIN prefix issued for the 140B. Machine runs a Cat 3306 diesel (naturally aspirated, inline six, about 10.5 L / 641 cu in displacement) rated near 112 kW (150 hp) net. Confirm exact build year and plant of origin with a dealer using the full PIN. |
Frequently asked questions
What engine powers the Caterpillar 140B motor grader?
The 140B uses Caterpillar's own 3306 inline six-cylinder diesel, naturally aspirated, displacing 10.5 L (640.8 cu in) and rated at approximately 150 hp (112 kW) gross.
What is the operating weight of the Caterpillar 140B?
Standard operating weight runs about 13.6 tonnes (roughly 30,000 lb), varying slightly with attachments such as a scarifier or ripper and with tire selection.
What replaced the Caterpillar 140B motor grader?
Caterpillar's 140G took over as the direct successor, followed later by the 140H, 140K, and 140M generations, and eventually the current Next Generation Cat 140 platform.
What 140B owners discuss
What engine is actually in a Cat 140B, and what do owners say about it?
The 140B is built around the Cat 3306 diesel, a naturally aspirated inline-six of roughly 10.5 L (638 cu in) displacement, rated around 112 kW (150 hp) gross on spec sheets — exact rating varies by governor setting and production year, so check the engine plate on your unit. Owners of this generation describe the 3306 as a simple, mechanically governed engine with jerk-type unit injectors: no electronic engine controls to chase, easy to keep running with basic diesel mechanic tools. Being naturally aspirated rather than turbocharged, it loses noticeable power at altitude or under a heavy blade load compared to later turbocharged 3306-powered graders, and it's slower to recover rpm after a hard cut. Blue-white smoke on a cold start that clears quickly is considered normal for this engine family; smoke that persists after warm-up points to worn rings, valve guides, or an injector needing service.
What powertrain and hydraulic behavior is typical for this generation of grader?
The 140B predates Cat's electronic transmission controls. Shifting runs through a mechanical powershift box with air- or hydraulically-actuated clutch packs, not a transmission control module, so there's no solenoid or sensor fault code to chase. The most common complaint on machines this age is clutch pack slip or delayed engagement between gears, which usually traces back to degraded or contaminated transmission oil before it traces to a worn clutch pack or valve body — a fluid and filter change with a fresh oil sample is the standard first troubleshooting step. Circle, blade lift, and lower circuits run through mechanical hydraulic control valves rather than joystick electro-hydraulics; sluggish or uneven blade response is more often worn valve spools or a tired hydraulic pump than anything electronic. The transmission-output parking/service brake on graders of this era is a safety-critical system tied into the same hydraulic circuit — have your dealer verify brake holding capacity and circuit pressure before returning the machine to regular grading work.
What wear patterns show up in the tandems and drivetrain?
Grading with a 140B loads the rear tandem drive cases the way tracks load a dozer's undercarriage, and that's where most drivetrain wear complaints concentrate. Chain and sprocket wear inside the tandem cases is the recurring issue — metal in the tandem oil, or banging and clunking under load, both point to stretched chains or worn sprockets needing inspection. Tandem oil level and condition get checked more often than most other fluids on these machines, since a low or contaminated tandem sump accelerates chain wear quickly. Up front, wheel lean cylinders and kingpins need regular grease; skipped greasing shows up as excess play in the wheel lean linkage and uneven front tire wear over time.
What's the drawbar, circle, and moldboard wear story on this generation of grader?
The drawbar-circle-moldboard assembly on mechanical-era graders like the 140B uses shims and adjustable wear strips rather than a sealed bearing, so it needs periodic manual adjustment as components wear in. The consistent theme among owners is checking circle-to-drawbar looseness on a set interval and re-shimming as needed rather than waiting for a full teardown — running the assembly loose accelerates wear on the circle teeth and drawbar ball noticeably faster. A one-way saddle cylinder on some configurations is a known slow-leak point; oil weeping from that cylinder onto the circle draws in dirt and abrasive grit, speeding up wear in that whole assembly, so it's worth checking during routine service rather than only when a leak becomes obvious.
Given the age of the 140B, what electrical or sensor issues come up?
The 140B predates electronic sensors and diagnostic modules on Cat graders, so its electrical system is limited to basic charging, starting, and gauge circuits. Consensus among owners of machines this age is that most electrical complaints trace back to corroded or brittle wiring, bad grounds, and worn gauge sender units rather than any control module — fixes are usually cleaning and resealing connections, replacing a sender, or running new wire, not diagnostics with a scan tool. Hard starting on a tired naturally aspirated 3306 is more commonly traced to weak batteries, worn starter brushes, or a neglected ether-start or glow-plug aid in cold weather than to a wiring fault. Any work on the starting circuit near the batteries should be done with the master disconnect off — have your dealer or a qualified technician verify the charging system before extended field use if the machine has sat unused for a long period.
What should a buyer check before purchasing a used Cat 140B?
Buyers of an older mechanical grader like the 140B consistently flag the same checkpoints. Check the circle and drawbar for looseness at the wear shoes and ball, and look for oil on the circle from a leaking saddle cylinder. Every cylinder rod on the machine should be dry — any wet rod or weeping seal is a repair to price into the offer. Confirm the rear tires are a matched, evenly worn set, since mismatched tandem tires stress the drive chains and driveline. Compare wear on the seat, pedals, and steering or articulation linkage against the hour meter reading to catch a meter that doesn't match actual use. Walk the tandem cases, pull an oil sample, and check for metal; cycle the transmission through all gears to feel for slip or delayed engagement. Given the age of these machines, budget for a full fluid and filter service plus a compression or leak-down check on the engine as part of the evaluation, and have your dealer or an independent diesel technician verify engine, transmission, and brake condition before final sale.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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