Caterpillar SPS342
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar SPS342 is an industrial engine arrangement, not a mobile machine: a skid-mounted pump-drive package built around the Cat 3412C, a turbocharged-and-aftercooled V-12 mechanical diesel of roughly 27 liters displacement. It carries no undercarriage or chassis in the earthmoving sense; the engine, radiator, driveline coupling, and controls bolt to a common steel baseframe (skid) that in turn bolts up to a customer-supplied pump. Bare engine dry weight runs roughly 2,300-2,600 kg (5,100-5,700 lb) depending on configuration, with the assembled skid package weighing more depending on the pump and accessories fitted. Production sits in the late 1990s, identified by the 2LZ serial prefix, alongside the truck-mounted sibling SPT342 built on the same engine family. Caterpillar offered this arrangement in a skid-mounted configuration only, distinct from the truck-mounted and other pumper and power-module variants in the same 3400-series family.
Within the 3412 lineage, the 3412C updated the base 3412 with a revised fuel system, turbocharger, and aftercooling for higher specific output while keeping the engine fully mechanical, with no electronic control module, which is exactly why these packages still see service today. Operators value the SPS342 and its siblings because a mechanical governor and injection pump are simple to diagnose and rebuild in the field without a laptop, and because parts commonality runs wide across the broader 3408/3412-based pumper, generator-set, and marine family that shares injection pumps, bearings, and seals. In the used and parts market, the SPS342 nameplate itself is uncommon next to Cat's mainstream mobile equipment, but the underlying 3412C powertrain is well supported through reman components and rebuild specialists serving oilfield and industrial pump-drive users, which keeps these skids economical to keep running well past their original service life.
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 SPS342 specifications
Engine
| Classification | Listed under Cat's Engine - Industrial line as a Pumper arrangement (stationary/skid-mounted pump-drive package), not a construction machine model |
| Engine family | Cat 3412C, a turbocharged-and-aftercooled V-12 mechanical diesel of roughly 27 liters displacement, with mechanical unit injection (no electronic control module). Truck-mounted sibling SPT342 uses the same base engine family |
| Rated power | Not published for the SPS342 arrangement on its own dataplate. Ratings across this pump-drive engine family generally fall 400-600 kW (roughly 640-1,050 hp) across a 1,700-2,100 rpm band; exact rating depends on the specific arrangement, driven pump, and fuel/altitude derate ordered with the package — verify against the unit's own nameplate |
| Displacement / cylinders | V-12, four-stroke diesel, roughly 27 liters |
| Emissions tier | Not applicable — pre-emissions-tier era mechanical diesel, no electronic control module |
Weights
| Operating weight | No single published figure covers the assembled skid package; it varies with the driven pump and accessories fitted. Verify against the specific unit's nameplate or fabrication drawing |
| Bare engine dry weight | Roughly 2,300-2,600 kg (5,100-5,700 lb), varying by accessory build |
| Ground pressure | Not applicable — stationary/skid-mounted pump-drive package |
Dimensions
| Transport length/width/height | Not documented — no source publishes package dimensions for this arrangement; dimensions depend on the skid fabricator and driven pump |
| Wheelbase / track gauge | Not applicable — skid-mounted stationary pump-drive unit, not a wheeled or tracked machine |
| Ground clearance | Not applicable |
Performance
| Travel speed | Not applicable — stationary pump-drive engine package, no travel function |
| Rated speed | 1,700-2,100 rpm band across this engine family; exact rated speed depends on the specific arrangement |
| Gradeability | Not applicable |
Service capacities (summary)
| Fuel tank | Not a fixed factory figure; normally paired with a job-supplied day tank or skid fuel tank sized to the application |
| Cooling system | Roughly 57-113 L (15-30 US gal), varying with the radiator or heat-exchanger package fitted to the skid |
| Engine oil | Roughly 64-72 L (17-19 US gal) with filter, varying by oil pan/sump and rating package |
| Hydraulic system | Not applicable — no hydraulic system is part of this engine arrangement; the driven pump end is mechanically coupled |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
SPS342 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | approx. 64-72 L (17-19 US gal), varies by oil pan/sump and rating package | Cat DEO or Cat DEO-ULS diesel engine oil. SAE 10W-30 for ambient -18C to 40C (0F to 104F); SAE 15W-40 for -9.5C to 50C (15F to 122F); use a multigrade for reliable cold starts, straight SAE 30 acceptable in consistently warm climates only |
| Cooling system | approx. 57-113 L (15-30 US gal), varies heavily with radiator vs heat-exchanger/keel-cooled package fitted to the skid | Cat ELC (Extended Life Coolant) or Cat DEAC (Diesel Engine Antifreeze/Coolant), full-strength premix to the freeze point required for the site's climate; do not mix coolant types; check glycol concentration each interval |
| Fuel tank | not a fixed factory figure - the SPS342 pump-drive package is normally paired with a job-supplied day tank or skid fuel tank sized to the application; OMM does not list one fixed tank capacity | No. 2-D diesel fuel, minimum cetane number 40; use a winter-blend or fuel conditioner in cold weather to prevent wax/gelling; keep water and sediment out of the tank |
| Transmission/powertrain compartment | not applicable | the SPS342 is a bare engine/pump-drive arrangement; the OMM does not list an onboard transmission compartment for this unit |
| Final drives (each) | not applicable | no final drives fitted; this is a stationary/skid-mounted pump-drive engine, not a mobile machine |
| Hydraulic system and tank | not applicable | no integral hydraulic system documented for the base pump-drive package; the driven pump end is mechanically coupled, not hydraulically powered, per available documentation |
| Axles/differentials | not applicable | none fitted; skid/stationary pump-drive configuration has no axles |
| Grease (spec only) | spec only - no fill quantity listed | Cat Multipurpose Grease (NLGI 2) for normal ambient service, roughly -30C to 40C; step down to a softer NLGI 1 or 0 grade, or Cat Utility Grease, for fan and idler bearings in sustained sub-zero cold-weather service |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar SPS342 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 3,000 h |
|
| Every 10,000 h |
|
Servicing the SPS342 beyond the schedule
Predictive Maintenance & Fluid Analysis
Pull an engine oil sample every 250 hours and a coolant sample every 500 hours; both catch fuel dilution, coolant additive depletion, and bearing wear on the 3412C V-12 well before failure. Track blow-by and boost pressure on the turbocharger, since this mechanical engine has no ECM to flag drift. Watch driveline coupling vibration signatures for early misalignment against the driven pump, and log injection-pump timing checks alongside oil trending.
Corrective & Common Repairs
Most SPS342 field failures trace to the mechanical fuel system: injection pump plunger wear, sticking nozzles, or governor linkage slop that shows up as rough idle or power loss under pump load. Radiator core plugging from skid-site dust and turbocharger shaft play are the next most common complaints. Check driveline coupling elastomers and alignment whenever the driven pump's discharge pressure or vibration changes, since a worn coupling masquerades as an engine problem.
Overhaul & Rebuild Points
The 3412C's cylinder liners, main/rod bearings, and turbocharger cartridge are the wear items that define overhaul timing on high-hour SPS342 units, most run in continuous oilfield or industrial pump-drive duty. Inspect the crankshaft and camshaft for wear at teardown, and rebuild the injection pump and turbocharger as a matched set rather than piecemeal. Re-verify driveline coupling alignment and skid mounting torque after any in-frame or out-of-frame rebuild before returning the package to service.
Seasonal & Environment Servicing
Skid-mounted in the open at wellsites and plants, the SPS342 sees wide temperature swings; use the coolant concentration appropriate for the season and verify glycol/inhibitor levels before winter. Dust and sand ingestion at drilling or industrial sites accelerates air cleaner and radiator core loading, so shorten cleaning intervals in high-dust environments. Drain fuel-water separators more often in humid or coastal locations, and inspect the skid's exposed wiring and shutdown sensors for corrosion after wash-downs.
SPS342 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1R-0749 | Filter-Fuel | Fuel system service | Check fitment → |
| 8H-2778 | Seal-Ring | Fuel system service | Check fitment → |
| 8H-7202 | Case As-Fuel Filter | Fuel system service | Check fitment → |
| 9M-2342 | Filter Element As-Fuel | Fuel system service | Check fitment → |
| 5P-2645 | Elbow-Unfiltered Fuel From Adapter | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SPS342 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Low Oil Pressure shutdown lamp (no CID/FMI, mechanical switch) | Engine oil pressure switch trips fuel shutoff below the set threshold for the running speed | Worn oil pump, plugged filter, low oil level, or a faulty pressure switch | Check oil level and filter condition, verify pressure at the gauge port before condemning the switch |
| High Jacket Water Temperature shutdown lamp | Coolant temperature switch trips fuel shutoff above the set limit | Low coolant, blocked radiator/heat exchanger, failed thermostat, or slipping fan belt | Check coolant level and radiator airflow, verify thermostat operation |
| Overspeed shutdown (mechanical/hydra-mechanical trip) | Governor overspeed device trips fuel shutoff when engine rpm exceeds the safe limit | Governor linkage fault, load loss on the driven pump, or a sticking fuel rack | Inspect governor linkage and fuel rack for binding before restarting |
| Low Coolant Level alarm lamp | Coolant level sensor or sight glass indicates level below minimum | External leak, internal leak (head gasket/liner seal), or normal evaporation not topped off | Inspect for external leaks first, pressure-test the cooling system if level keeps dropping |
| Low Fuel Pressure/Fuel Supply alarm | Fuel pressure at the transfer pump or filter housing falls below normal | Clogged fuel filter, air in the fuel system, or a weak transfer pump | Check for restriction at the primary filter/strainer and bleed air from the system |
| Low Battery Voltage / Charging alarm | Alternator output or battery voltage is below the normal charging range | Failed alternator, loose or corroded battery cables, worn belt | Check belt tension and alternator output, clean and tighten battery connections |
| High Air Inlet Restriction indicator | Air filter restriction gauge shows the element is loading up | Dirty or clogged air filter element | Service or replace the air filter element, check the restriction indicator resets |
| Low Coolant/Low Oil Pre-Alarm (warning stage before shutdown) | Warning-stage lamp/horn ahead of the automatic shutdown trip point | Same root causes as the corresponding shutdown condition, caught earlier in the trend | Investigate immediately to avoid an unplanned shutdown; don't just silence the horn |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SPS342 attachments & work tools
Machine type and scope of this section
SPS342 is a skid-mounted industrial pumper package built around a 3412-family V12 diesel engine, sold to well-service and pump-drive integrators rather than as a self-contained work machine. It does not take earthmoving-style work tools (buckets, forks, blades, couplers); there is no factory attachment lineup for this designation.
Driveline coupling to the pump end
The engine mounts on a common skid base and drives a separate, customer- or integrator-supplied pump end (for example a well-service or frac pump) through a flywheel-housing coupling and driveshaft arrangement. The coupling and driven pump are matched by the pump packager, not offered as a Cat work-tool option.
Mounting arrangement / sibling configurations
SPS342 denotes the skid-mounted version of this engine-pumper package; a truck-mounted counterpart is documented under a separate SPT-prefixed designation using the same base engine. Choice between skid and truck/trailer mounting is a packaging decision made at the integrator level, not a bolt-on attachment.
Air inlet, exhaust, and cooling arrangement
Factory documentation shows dedicated air-inlet-and-exhaust piping and elbow assemblies specific to the skid installation, reflecting a fixed industrial routing rather than an operator-selectable option. Cooling is typically handled by a radiator or heat-exchanger package sized to the skid, matched to ambient and duty-cycle needs by the integrator.
Guarding and enclosure options
As a stationary/skid industrial power unit, guarding centers on rotating-driveline shielding (coupling and driveshaft guards) and standard engine safety guards rather than ground-engaging work-tool guarding. No dedicated enclosure or canopy option is documented specifically under the SPS342 designation; enclosures, if fitted, are typically supplied by the skid or pump packager.
Work-tool/attachment verdict for this model
No buckets, forks, rippers, couplers, or other ground-engaging work tools apply to this designation. Treat any listing that ties SPS342 to loader- or dozer-style attachments as contamination from an unrelated Cat model.
All SPS342 assemblies by section
Every catalogued assembly group for the Caterpillar SPS342. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
9y-8810 Aftercooler Gp-Water
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 13 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 10 |
| 0S***17 | Bolt --Use Open Hole In Compressor Body | 1 |
102-0292 Cartridge Gp-Turbocharger
| 10***92 | Cartridge Group-Turbocharger | 1 |
| 10***40 | Ring-Seal | 1 |
| 10***42 | Kit-Cartridge; (Turbocharger) | 1 |
4p-2785 Cartridge Gp-Turbocharger
| 1P***20 | Ring-Seal | 1 |
| 1S***70 | Nut (.687" O.D.) | 1 |
| 4P***85 | Cartridge Group-Turbocharger | 1 |
9y-8811 Lines Gp-Air
| 0L***29 | Bolt- 7.63 cm(3 In.) Long - Location "H" | 2 |
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 10 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 8 |
147-6786 Manifold Gp-Exhaust
| 11***23 | Spacer; (11.13x19.05x19-mm Thk) | 24 |
| 12***25 | Manifold-Exhaust | 2 |
| 12***18 | Manifold-Exhaust | 2 |
147-7336 Shield Gp-Manifold
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 2 |
| 0T***02 | Bolt; (3/8-16x0.625-In)(Shield To Head) | 16 |
9y-8814 Turbocharger Gp
| 10***90 | Turbocharger Group | 2 |
| 2N***66 | Locknut; (3/8-16-Thd)(High Temperature) | 16 |
| 4P***82 | Turbocharger Group | 2 |
102-0290 Turbocharger Gp
| 10***90 | Turbocharger Group | 1 |
| 10***92 | Cartridge Group-Turbocharger | 1 |
| 2W***42 | Housing-Turbine; (Turbine) | 1 |
4p-2782 Turbocharger Gp
| 4P***82 | Turbocharger Group | 1 |
| 4P***85 | Cartridge Group-Turbocharger | 1 |
| 7E***82 | Housing | 1 |
Basic Engine
9y-9466 Adapter Gp-Flywheel
| 3G***56 | Washer-Special; (5.0mm Thk) | 12 |
| 8M***55 | Gear-Flywheel Starter; (136 Teeth) | 1 |
| 9Y***45 | Bolt-12 Point Head; (5/8-18x3.5-In) | 12 |
4n-0965 Camshaft Gp
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 10***74 | Gear-Camshaft Drive; (86-Teeth) | 1 |
| 1B***05 | Key; (Woodruff) | 1 |
7e-8818 Cover Gp-Cylinder Block
| 0S***66 | Bolt-Pulley To Crankshaft Adapter | 3 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 2 |
183-6229 Cover Gp-Cylinder Block
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 6 |
| 18***29 | Cover Group-Cylinder Block | 1 |
2w-9319 Cover Gp-Cylinder Block
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 9 |
| 23***37 | Seal-Integral | 1 |
4n-6798 Cover Gp-Front Housing
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 6 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 3 |
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 2 |
9y-9827 Cover Gp-Oil Pan -Lh
| 06***58 | Seal-O-Ring; (Oil Pan Drain Plug) | 1 |
| 0S***87 | Bolt-Bracket Assembly To Timing Gear | 2 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 5 |
9y-8482 Cover Gp-Valve Mechanism -Lh Service
| 27***83 | Seal-O-Ring | 7 |
| 4W***80 | Base-Valve Mechanism Cover | 4 |
| 5P***78 | Seal; (2.3-M) (Valve Mechanism Cover) | 0 |
4n-0922 Crankshaft Gp
| 11***66 | Gear-Crankshaft; (99-Teeth) | 1 |
| 19***23 | Kit-Crankshaft Bearing; (Crankshaft) | 0 |
| 2W***33 | Seal Group-Crankshaft; (Front) | 1 |
126-1372 Cylinder Block As
| 12***72 | Cylinder Block As | 1 |
| 2W***15 | Insert-Liner Seat; (1.605-mm Thk)(1.59mm Thk) | 0 |
| 3P***23 | Bolt-Bearing Cap; (7/8-14x7.75-In) | 14 |
126-1375 Cylinder Block As
| 11***20 | Seal-O-Ring; (Mid-Liner) | 12 |
| 12***75 | Cylinder Block As | 1 |
| 14***17 | Seal-O-Ring; (140.20mm Id) | 12 |
126-1373 Cylinder Block Gp
| 11***27 | Seal-O-Ring; (19.18mm Id) | 8 |
| 12***72 | Cylinder Block As | 1 |
| 12***73 | Cylinder Block Group | 1 |
7e-3762 Cylinder Block Gp
| 12***75 | Cylinder Block As | 1 |
| 22***00 | Plate-Spacer | 2 |
| 22***01 | Gasket-Plate | 2 |
126-1374 Cylinder Block Gp
| 11***27 | Seal-O-Ring; (19.18mm Id) | 8 |
| 12***72 | Cylinder Block As | 1 |
| 12***74 | Cylinder Block Group | 1 |
143-0047 Cylinder Head As
| 14***46 | Cylinder Head As | 1 |
| 14***47 | Cylinder Head As | 1 |
| 17***88 | Guide-Valve; (Standard) | 24 |
143-0046 Cylinder Head As
| 14***46 | Cylinder Head As | 1 |
| 1W***83 | Insert-Valve Seat; (Exhaust)(Standard) | 12 |
| 3B***23 | Core Plug--Flywheel Housing Pinion Shaft Hole | 12 |
9y-8510 Cylinder Head Gp
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 18 |
| 0T***55 | Bolt; (3/8-16x4.25-In)(Location S) | 2 |
| 10***20 | Adapter-Nozzle; (Direct Injection) | 12 |
141-3228 Cylinder Head Gp
| 12***21 | Valve-Exhaust | 12 |
| 12***22 | Valve-Inlet | 12 |
| 14***28 | Cylinder Head Group | 1 |
9y-8504 Damper & Pulley Gp
| 0L***29 | Bolt- 7.63 cm(3 In.) Long - Location "H" | 12 |
| 16***31 | Damper As | 2 |
| 6V***73 | Bolt; (5/8-18x8.5-In) | 12 |
4n-6341 Gear Gp-Front -Timing
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
| 0T***73 | Bolt (3/8) (63.5mm Long) (On Cab Of Cover Assem.) | 1 |
| 11***17 | Plate-Thrust | 1 |
9y-8807 Housing Gp-Flywheel
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 1 |
| 0T***73 | Bolt (3/8) (63.5mm Long) (On Cab Of Cover Assem.) | 1 |
| 16***93 | Gasket-Cylinder | 1 |
9y-8505 Housing Gp-Front
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 3 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 2 |
| 16***45 | Gasket-Cylinder Block | 1 |
9y-8806 Lifting Gp-Engine -Lh
| 0L***78 | Bolt,Machine Governor And Decelerator Control | 1 |
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 4 |
| 2A***38 | Bolt-(3/4" X 2-1/4")-Rops Mounting Bracket To Fender | 2 |
9y-8809 Pan Gp-Oil -Engine
| 2P***03 | Bolt-Washer Head; (3/8-16x1.25-In) | 40 |
| 3B***51 | Plug (Use Without Low Temperature Sensor) | 2 |
| 4N***51 | Gasket; (Engine Oil Pan) | 1 |
7e-3973 Piston & Rod Gp
| 12***12 | Crown As-Piston | 1 |
| 13***61 | Ring-Piston; (Top)(Top) | 1 |
| 15***56 | Bolt-Special; (Oil Jet) | 1 |
7w-5926 Rocker Arm Gp
| 00***03 | Ring-Retaining | 2 |
| 0L***22 | Plug (.656" Dia.) | 2 |
| 10***03 | Screw; (3/8-24x1.67-In)(Intake) | 6 |
7w-5927 Rocker Arm Gp
| 00***03 | Ring-Retaining | 2 |
| 0L***22 | Plug (.656" Dia.) | 2 |
| 10***03 | Screw; (3/8-24x1.67-In)(Intake) | 6 |
7e-6385 Support Gp-Engine
| 0S***66 | Bolt-Pulley To Crankshaft Adapter | 4 |
| 4D***04 | Washer,Flat Cover Mtg,Accessory Drive | 4 |
| 4N***84 | Support-Front Engine | 1 |
4n-4303 Trunnion Gp-Engine
| 0S***73 | Bolt (102mm Long); (1/2-13x4-In) | 6 |
| 4N***03 | Trunnion Group-Engine; Engine Trunnion Group | 1 |
| 4W***50 | Adapter-Support | 1 |
4n-7352 Valve Mechanism Gp
| 10***89 | Bridge-Valve | 24 |
| 10***88 | Valve Lifter Assem | 24 |
| 23***85 | Bolt-12 Point Head; (3/4-16x11.5-In) | 1 |
Cooling System
9y-8479 Coolant Conditioner Gp
| 1W***06 | Hose Assem. 137 cm(53.94 In.) | 1 |
| 1W***18 | Filter-Coolant Conditioner; (Precharge) | 1 |
| 2N***37 | Elbow-Flared | 1 |
4n-2388 Cooler Gp-Engine Oil
| 10***77 | Seal-O-Ring; (100.97mm Id) | 2 |
| 4N***88 | Cooler Group-Engine Oil; Engine Oil Cooler Group | 1 |
| 7C***45 | Core As-Oil Cooler; (Water Lines) | 1 |
4w-0419 Core Gp-Oil Cooler
| 4W***19 | Core Group-Oil Cooler; -Transmission | 1 |
| 5M***14 | Pipe Plug Cylinder Block Oil Pressure | 2 |
9y-8506 Lines Gp-Water
| 03***16 | Elbow; (Pipe) | 1 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 4 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 3 |
9y-8480 Lines Gp-Water
| 1D***66 | Bolt Bracket Assembly To Yoke | 1 |
| 24***13 | Regulator-Water Temperature; (92-Deg C)(Water, Coolant Temperature) | 2 |
| 2H***93 | Ferrule | 1 |
137-1339 Pump Gp-Water
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 1 |
| 10***30 | Bearing As-Roller | 1 |
| 11***21 | Plug-Felt; (Water Pump Housing) | 1 |
4n-5837 Pump Gp-Water
| 10***49 | Adapter-Inlet | 1 |
| 11***79 | Seal-O-Ring | 1 |
| 11***80 | Seal-O-Ring | 1 |
Electrical And Starting System
7g-7889 Alternator Gp-Charging
| 03***12 | Screw-Forming; (10-24x0.5-In) | 5 |
| 11***19 | Diode As-Alternator | 1 |
| 18***34 | Nut-Flange; (5/8-18-Thd) | 1 |
142-6117 Alternator Gp-Charging
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 1 |
| 0S***87 | Bolt-Bracket Assembly To Timing Gear | 1 |
9y-8500 Control Gp-Engine Electronic
| 11***89 | Cover | 1 |
| 11***19 | Control Group-Engine Electronic | 1 |
| 6V***79 | Seal-O-Ring; (72.62-mm Id) | 1 |
115-7719 Control Gp-Engine Electronic
| 11***19 | Control Group-Engine Electronic | 1 |
| 3E***99 | Plate-Marking | 1 |
161-9926 Sensor Gp-Pressure
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
| 16***26 | Sensor Group-Pressure; -Atmospheric Air, Turbo Inlet | 1 |
| 18***40 | Socket-Connector; (14-Ga To 18-Ga)(14-Ga To 18-Ga) | 3 |
163-8516 Sensor Gp-Pressure
| 16***16 | Sensor Group-Pressure; -Boost And Engine Oil | 1 |
| 19***26 | Harness As-Sensor; (16-18 Ga Wire)(Engine Oil Temperature) | 1 |
| 19***27 | Harness As-Sensor; (14-Ga Wire)(Engine Oil Temperature) | 1 |
106-0543 Sensor Gp-Speed
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***43 | Sensor Group-Speed; -Transmission Output | 1 |
| 17***49 | Strap; (Marker) | 1 |
193-5518 Sensor Gp-Speed
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 3 |
| 19***18 | Sensor Group-Speed; -Engine | 1 |
| 8T***32 | Receptacle-Connector; (3-Pin)(Throttle Position Sensor) | 1 |
7x-1043 Sensor Gp-Temperature
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 3 |
| 7X***43 | Sensor Group-Temperature; (Scm Engine Oil Temp Sensor) | 1 |
| 8T***32 | Receptacle-Connector; (3-Pin)(Throttle Position Sensor) | 1 |
112-6658 Wiring Gp-Engine
| 03***83 | Screw-Machine | 3 |
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 3 |
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 1 |
120-4887 Wiring Gp-Engine
| 03***83 | Screw-Machine | 3 |
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 3 |
| 0L***52 | Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex) | 1 |
Engine Arrangement
151-4496 Engine Ar
| 11***58 | Wiring Group-Engine | 1 |
| 11***75 | Pump Group-Gov & Fuel Inj | 1 |
| 14***17 | Alternator Group-Charging | 1 |
Fuel System
4n-7935 Cover Gp-Fuel Filter Base
| 1P***36 | Gasket; (Fuel Priming Pump)(Fuel Priming Pump) | 1 |
| 4N***35 | Cover Group-Fuel Filter Base; Fuel Filter Base Cover Group | 1 |
| 6N***14 | Cover-Filter Base; (Fuel) | 1 |
7e-0524 Drive Gp-Governor & Fuel Pump
| 1T***14 | Bolt-12 Point Head; (5/16-18x1-In) | 1 |
| 6N***23 | Slide | 2 |
| 6N***56 | Weight-Advance | 2 |
4n-6925 Filter Gp-Fuel
| 1R***49 | Filter-Fuel; (Advanced Efficiency)(Secondary) | 2 |
| 3J***07 | Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve | 1 |
| 4N***25 | Filter Group-Fuel; Filter Group-Fuel | 1 |
9y-8483 Filter Gp-Primary Fuel
| 00***62 | Elbow (To Primary Filter Base) | 1 |
| 03***94 | Connector-Flared | 1 |
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 2 |
4p-8235 Governor Gp
| 10***23 | Spacer; (7.5x11.3x17-mm Thk) | 3 |
| 1N***00 | Sleeve-Rack Control | 1 |
| 1N***01 | Spring-Link | 1 |
4p-8482 Lever Gp-Governor Control
| 1H***00 | Pin--To Compression Release Shaft | 1 |
| 4P***89 | Lever As | 1 |
| 4P***52 | Clamp | 1 |
9y-8476 Lines Gp-Fuel Filter
| 03***47 | Elbow-Filtered Fuel From Based Assembly | 4 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 7 |
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 1 |
4p-9484 Lines Gp-Fuel Injection
| 05***94 | Bolt-12 Point Head; (3/8-16x1.75-In) | 5 |
| 10***64 | Tube As | 1 |
| 13***04 | Nozzle As-Fuel Injection | 12 |
4p-9632 Lines Gp-Fuel Injection
| 10***38 | Screw-Machine | 5 |
| 10***39 | Screw As | 3 |
| 10***88 | Clamp As | 1 |
4p-9631 Lines Gp-Fuel Injection
| 10***38 | Screw-Machine | 3 |
| 10***39 | Screw As | 3 |
| 10***88 | Clamp As | 1 |
108-6633 Pump Gp-Fuel Injection
| 10***02 | Bonnet-Valve | 1 |
| 10***04 | Plunger & Barrel As | 1 |
| 10***33 | Pump Group-Fuel Injection | 1 |
116-4074 Pump Gp-Fuel Injection
| 0S***15 | Bolt 19 mm (.75 In.) Long Return Air Console To Enclosed Rops | 26 |
| 10***33 | Pump Group-Fuel Injection | 12 |
| 11***94 | Bushing | 12 |
145-8855 Pump Gp-Fuel Priming
| 13***41 | Pump Group-Fuel Priming; (Hand) | 1 |
| 14***55 | Pump Group-Fuel Priming | 1 |
| 1B***90 | Bolt; (5/16-18x1.375-In)(Rh Front Cover) | 1 |
8n-3365 Pump Gp-Fuel Priming
| 10***08 | Pump As; (Fuel Priming) | 1 |
| 1B***82 | Bolt (1.25 In. Long X .313 In. Dia.) | 1 |
| 1J***71 | Seal (10.52 Degrees I.D.); Seal-O-Ring -- To Adapter | 2 |
4n-3287 Pump Gp-Fuel Priming
| 10***08 | Pump As; (Fuel Priming) | 1 |
| 1P***36 | Gasket; (Fuel Priming Pump)(Fuel Priming Pump) | 1 |
| 4N***87 | Pump Group-Fuel Priming; Pump Group-Fuel Priming | 1 |
116-4075 Pump Gp-Gov & Fuel Inj
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 7 |
| 10***39 | Solenoid-Rotary | 1 |
| 10***73 | Pump Group-Fuel Transfer | 1 |
116-4073 Pump Gp-Gov & Fuel Inj
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 2 |
| 10***82 | Housing As-Drive | 1 |
| 10***16 | Plug; (3/8-32-Thd)(3/8-32 Unef 2a Thd) | 1 |
108-3797 Servo Gp-Rotary -Fuel Inj Pump
| 00***93 | Seal-O-Ring (Id=52.07mm); (52.07-mm Id) | 1 |
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 1 |
| 10***95 | Cover-Oil Pump | 1 |
Lubrication System
9y-2989 Breather Gp
| 2N***09 | Clamp; (V-Band) | 1 |
| 4F***90 | Seal (2.10" Inside Diameter) | 1 |
| 4N***68 | Breather As; (Crankcase) | 1 |
4n-2481 Fastener Gp-Oil Pump Mounting -Engine
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 2 |
| 0S***90 | Bolt; (3/8-16x2in)(Clip Thru Spacer To Bracket As) | 1 |
| 4N***81 | Fastener Group-Oil Pump Mounting; Oil Pump Mounting Fastener Group | 1 |
2w-6537 Filler Gp-Engine Oil
| 12***97 | Tube As | 1 |
| 2N***09 | Clamp; (V-Band) | 1 |
| 2W***37 | Filler Group-Oil | 1 |
9y-1911 Filter Gp-Engine Oil
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 5 |
| 1P***67 | Plunger; (Engine Oil Cooler Relief Valve) | 1 |
| 1R***08 | Filter As-Engine Oil; (Advanced Efficiency)(High Efficiency) | 2 |
9y-0992 Gauge Gp-Oil Level (Dipstick) -Lh Rear
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 1 |
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 1 |
| 11***68 | Seal-O-Ring; (15.54mm Id) | 1 |
9y-8484 Lines Gp-Engine Oil
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 5 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 1 |
9y-8812 Lines Gp-Turbocharger Oil
| 06***61 | Seal-O-Ring (Id=40.87mm) | 2 |
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 5 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 10 |
6n-1030 Pump Gp-Engine Oil
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 4 |
| 1M***44 | Bolt; (3/8-16x2-1/4 In) | 2 |
| 1W***38 | Shaft As-Pump Drive; (8-Teeth) | 1 |
Prime Package
150-5383 General Ar-Pumper
| 11***88 | Film; (Identification) (Fuel Filter) (On Secondary Fuel Filter) | 2 |
| 11***52 | Plate & Film Group; -Engine Information | 1 |
| 15***83 | General Ar-Pumper | 1 |
155-1039 Guard Gp-Drive Shaft
| 15***96 | Engine Ar | 1 |
| 15***39 | Guard Group-Drive Shaft | 1 |
155-1190 Lines Gp-Vent
| 11***93 | Lockwasher | 16 |
| 14***37 | Bracket | 2 |
| 14***42 | Washer; (10.2x18.5x2.5-mm Thk) | 32 |
Service Equipment And Supplies
6l-4502 Chart-Plate & Film
| 14***42 | Washer; (10.2x18.5x2.5-mm Thk) | 4 |
| 15***92 | Locknut; (3/8-16 Thd) | 2 |
| 16***37 | Tee-Pipe | 1 |
SPS342 serial number reference
On the SPS342 pumper package, the engine serial/PIN tag is riveted to the 3412C block, typically near the flywheel housing or valve cover, and reads under its own serial series. The pump skid/general arrangement carries a separate unit ID plate with its own serial series, usually near the control panel. A third, narrower serial series can appear on the engine electrical control and mounting group itself. Read the first 3 characters as the model/generation prefix, then the digits that follow as the sequential unit number for that prefix, and match the prefix to the specific assembly (engine vs. skid vs. electrical control) you are ordering for.
| Prefix | Identifies | Notes |
|---|---|---|
| 2LZ | Pumper package, 3412C engine (general arrangement/unit serial series) | Covers the SPS342 pumper general arrangement. Low serial range (roughly 1 through 217/218) is the truck-mounted pumper configuration; from about serial 219 up it is the skid-mounted pumper configuration. Same 3412C diesel across both sub-configurations. |
| 2SZ | Pumper package, 3412C engine (engine serial series) | Separate serial track scoped to the 3412C engine itself, distinct from the 2LZ arrangement/unit prefix used for the pump skid and general hardware. Covers engine-only groups such as the governor and fuel injection pump, oil pump mounting hardware, and engine lifting brackets. |
| 5LJ | Pumper package, 3412C engine, electrical control and mounting group (confirm with dealer for scope beyond this assembly) | Narrower serial series tied specifically to the engine electrical control and mounting group, with a running change around serial 315/316. Scope is limited to that assembly; confirm with your dealer before applying it outside the electrical control group. |
Frequently asked questions
What engine powers the Caterpillar SPS342?
A Caterpillar 3412C, a four-stroke turbocharged-and-aftercooled V-12 mechanical diesel of roughly 27 liters displacement, arranged as a skid-mounted pump-drive package. Ratings for this pump-drive family generally fall in the 400-600 kW (roughly 640-1,050 hp) range across a 1,700-2,100 rpm band; the exact rating depends on the specific arrangement, driven pump, and fuel/altitude derate ordered with the package.
What does the SPS342 weigh?
The bare 3412C engine has a dry weight of roughly 2,300-2,600 kg (5,100-5,700 lb) depending on the exact accessory build. The complete SPS342 skid package, including radiator, coupling, guarding, and baseframe, weighs more, and no single published figure covers every build since it varies with the skid fabricator and the pump it's paired with. Verify total package weight against the specific unit's nameplate or fabrication drawing.
What replaced the SPS342?
Caterpillar does not publish a direct, named successor to the SPS342 skid-mounted pumper. It belongs to a late-1990s family of 3412/3412C-based pump-drive packages alongside the truck-mounted SPT342 and related pumper arrangements. Later Cat pump-drive packages for higher-horsepower oilfield and industrial duty moved toward larger-displacement engines, but no specific one-for-one replacement is documented; confirm current pump-drive options with a Cat dealer.
What SPS342 owners discuss
What engine actually sits under an SPS342 pump-drive skid?
What cooling problems come up most on these skid-mounted pump engines?
Any fuel-system quirks specific to this V12 mechanical setup?
How does the turbo behave under continuous load, and are there sensor gremlins to watch?
What driveline/coupling behavior should I expect between the engine and the pump end?
Why won't it restart cleanly after sitting idle between jobs?
What should I check before buying a used SPS342 package?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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