Caterpillar SR117
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar SR117 is a two-stage snow blower work tool, not a self-propelled machine. It has no engine, ECM, fuel system, or coolant system of its own; a hydraulic motor fed by the host carrier's auxiliary circuit drives the auger and impeller through a chain drive, and the attachment has no onboard hydraulic reservoir. Sized for the small-frame end of Cat's skid steer and compact track loader line, it is documented as compatible with 216B3, 226B3, and 247B3-class carriers. Operating weight runs 404.5-419 kg (890-924 lb) depending on catalog edition, with intake width around 1.70 m (67 in) and a maximum throw near 9.1 m (30 ft). It mounts through the standard Cat SSQA quick-attach coupler and offered no separate factory configurations beyond this single size; it shares a parts and serial-prefix family with the SR118, SR121, SR318, and SR321 siblings and was later discontinued in favor of the SR115.
Across its catalog life the SR117 shows minor revisions rather than a hard generational split: published overall height, hydraulic flow window, and operating weight shift slightly between catalog editions, and a hydraulic operating pressure rating was added in the later edition without changing the attachment's basic architecture. Cat eventually replaced the whole small-frame end of the snow blower lineup with the SR115, which carries its own dimensions and flow rating rather than being a spec-for-spec swap. In the used and parts market the SR117 still matters because it was a common fit for municipal, landscape, and small-contractor fleets running compact skid steers, and its shared drivetrain architecture and serial-prefix parts grouping with SR118/SR121/SR318/SR321 keeps wear parts and drive components sourceable even though the model itself is out of current production.
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 SR117 specifications
Engine
| Power source | No onboard engine or ECM. SR117 is a passive, hydraulically driven two-stage snow blower work tool powered entirely by the host carrier's auxiliary hydraulic circuit. |
| Emissions tier | Not applicable — no engine fitted to this attachment. |
Weights
| Operating weight | 419 kg (924 lb) per the current factory spec sheet. An earlier catalog edition listed 404.5 kg (890 lb) for the same SR117 designation — weight varies slightly by publication/model year. |
| Shipping weight | Not separately published; attachment ships assembled at operating weight. |
| Ground pressure | Not applicable — mounted work tool, not a self-supporting undercarriage. |
Dimensions
| Intake width | 1702 mm (67 in) |
| Overall width | 1765 mm (69.5 in) |
| Cutting height | 610 mm (24 in) |
| Overall height | 1797 mm (71 in) per the current factory spec sheet. An earlier catalog edition listed 1582 mm (62.3 in) — height figure varies by catalog edition. |
| Overall length | 1148 mm (45.2 in) |
| Auger diameter | 305 mm (12 in) |
| Impeller/fan diameter | 517 mm (20 in) |
| Impeller/fan width | 229 mm (9 in) |
| Chute rotation | 180° |
Performance
| Maximum snow throw distance | 9.1 m (30 ft), theoretical value at 100% efficiency |
| Required hydraulic flow | 53-75 L/min (14-20 gpm) per the current factory spec sheet. An earlier catalog edition listed a narrower 53-65 L/min (14-17 gpm) range for the same model. |
| Hydraulic system operating pressure | 230 bar (3,340 psi), figure introduced in the later catalog edition; not listed in the earlier one |
| Compatible carrier machines | Cat 226B3 and 247B3 skid steer loaders per the current factory spec sheet. An earlier catalog edition also listed the smaller 216B3 skid steer loader as compatible; confirm current fit with your dealer if running an older carrier. |
| Gradeability | Not applicable — passive work tool, no independent travel or grade rating. |
Service capacities (summary)
| Fuel tank | Not applicable — no engine on this attachment. |
| Engine oil | Not applicable — no engine on this attachment. |
| Cooling system | Not applicable — no engine on this attachment. |
| Hydraulic system | No separate onboard reservoir; the attachment draws directly from the host carrier's hydraulic system. Required flow and pressure are listed under Performance. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
SR117 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not applicable — the SR117 is a passive, hydraulically driven attachment with no onboard engine. | Not applicable. |
| Cooling system | Not applicable — no engine or radiator on the attachment itself. | Not applicable. |
| Fuel tank | Not applicable — the attachment carries no fuel of its own. | Not applicable. |
| Transmission/powertrain | Not applicable — the two-stage auger and impeller are driven by a hydraulic motor through a chain drive, not a self-contained transmission. | Not applicable. |
| Final drives / axles / differentials | Not applicable — the SR117 has no axles or final drives; it is a mounted work tool, not a self-propelled machine. | Not applicable. |
| Hydraulic system and tank | No dedicated tank or reservoir capacity for the attachment. The SR117 draws hydraulic flow and pressure from the host carrier's own hydraulic system (rated flow window and pressure vary by host machine and are matched at setup). | Use the hydraulic oil specified in the host carrier's own operation and maintenance manual — the SR117 OMM does not call out its own hydraulic fluid, since it shares the host's circuit. Exposed chrome rod surfaces on the attachment's hydraulic cylinders get a coat of Caterpillar rust-preventative oil to protect against corrosion. |
| Auger and impeller bearings (grease points) | Lubricate at each auger bearing and both impeller bearings on a 30-service-hour interval; no fill quantity is specified, apply until fresh grease is visible at the fitting. | Caterpillar Multipurpose Grease containing three to five percent molybdenum disulfide, meeting MIL-M-7866 Grade 2 (NLGI 2). No separate cold-weather viscosity grade is called out in the OMM for this grease. |
| Discharge chute and coupler drive chains | Apply lubricant at each 30-service-hour interval; no volume specified — the OMM calls for a light, even coat rather than a metered fill. | Clean engine oil, applied directly to the chain links. No specific engine-oil brand or viscosity grade is named for this application in the SR117 manual. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar SR117 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 30 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the SR117 beyond the schedule
Hydraulic Flow & Fluid Health Checks
The SR117 has no engine oil or coolant to sample; its predictive maintenance is hydraulic. Confirm the host carrier's auxiliary circuit stays within the SR117's rated 53-75 L/min (14-20 gpm) window before hooking up, since excess flow drives premature chain and motor wear. Watch for foaming, discoloration, or metal fines in the host machine's hydraulic oil, since the attachment shares that circuit rather than carrying its own reservoir. Track chain case lubricant condition at scheduled intervals for early wear signs.
Corrective & Common Repairs
Sheared auger pins are the most common field fix; replace with factory-spec pins only, never oversized substitutes, since an oversized pin shifts shock loads onto the chain drive and gearbox instead of protecting them. Cracked flighting welds, worn reversible cutting edges, and ice-packed chute binding round out the common repair list. Diagnose stalls or weak throw by checking the host carrier's auxiliary hydraulic solenoid and flow output first, since the SR117 generates no fault codes of its own.
Overhaul & Rebuild Points
Major rebuild work centers on the enclosed chain drive to the auger and impeller: sprocket wear, chain stretch, and gearbox seal condition are the checkpoints at teardown. Auger and impeller shaft bearings, the reversible flighting, and the discharge chute rotation gear are the other components that decide a rebuild-versus-replace call. Because the SR117 shares its serial prefix and parts family with the SR118, SR121, SR318, and SR321, confirm exact drivetrain components against the unit's own serial plate before ordering.
Seasonal & Cold-Weather Servicing
Pre-season, grease every auger and impeller bearing and coat exposed cylinder rods with rust-preventative oil before storage humidity sets in. Clean, salt-free coupler connections matter more on this attachment than on summer tools, since road salt and slush accelerate corrosion at the coupler and chain drive. End of season, clear all packed ice from the chute rotation gear, verify skid shoe adjustment ahead of the next snowpack, and drain trapped moisture before off-season storage.
SR117 attachments & work tools
Core work tool identity
The SR117 is itself a two-stage snow blower attachment, not a base machine. It uses an auger plus impeller to move a high volume of snow, with intake width around 1.70 m (67 in) and overall width near 1.77 m (69.5 in). Maximum throw distance is about 9.1 m (30 ft), with an auger diameter near 305 mm (12 in).
Base machine compatibility / size class
Fits Cat compact skid steer and multi-terrain loaders in the small frame class, documented compatibility includes the 216B3, 226B3 and 247B3 platforms. Larger frame skid steers, compact track loaders and compact wheel loaders are covered by other sizes in the same snow blower lineup, not this specific unit.
Coupler / mounting system
Mounts through the standard Cat skid steer quick-attach (SSQA) hydraulic coupler common to the skid steer and multi-terrain loader line. Pins engage from the cab controls once the coupler is tilted back to seat the tool, with auxiliary hydraulic lines connected through the machine's quick-attach hydraulic couplers.
Hydraulic requirement
Runs on the base machine's standard auxiliary hydraulic circuit, no dedicated high-flow kit is required for this size. Typical flow is in the range of 53-75 L/min (14-20 gpm) at roughly 200-230 bar (2,800-3,300 psi); exact figures vary by source and machine configuration, verify against the specific loader's hydraulic output.
Wear and cutting components
Equipped with a bolt-on reversible cutting edge and adjustable, hardened skid shoes for ground clearance and wear life. The auger and impeller are also reversible, which simplifies servicing wear parts across the cutting and throwing path.
Chute and deflector control
Chute rotation covers about 180 degrees, letting snow discharge to the front or either side to keep it clear of the operator. Chute and deflector positioning is run hydraulically through the machine's joystick controls, with no separate wiring harness needed beyond the standard attachment connection.
Guarding and factory options
No model-specific factory guarding package (e.g., cab shields or light kits) is documented for the SR117 in available literature; general snow blower options across the family can include work lights and offset/hydraulic deflector chutes. Confirm current option availability with a Cat dealer since packages vary by region and machine generation.
All SR117 assemblies by section
Every catalogued assembly group for the Caterpillar SR117. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Electrical System
261-4419 Wiring Gp-Work Tool
| 10***67 | Washer-Hard; (7.2x25x2-mm Thk) | 2 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 3 |
| 11***15 | Relay As; (12-Volt)(Junction Box) | 2 |
281-3790 Wiring Gp-Work Tool
| 10***67 | Washer-Hard; (7.2x25x2-mm Thk) | 2 |
| 11***15 | Relay As; (12-Volt)(Junction Box) | 2 |
| 12***78 | Locknut; (M6x1-Thd) | 4 |
Frame And Body
290-8925 Deflector Gp-Snowblower
| 03***55 | Locknut; (5/16-18-Thd)(Marked X) | 6 |
| 12***78 | Locknut; (M6x1-Thd) | 2 |
| 13***85 | Rivet-Pop | 7 |
290-8888 Deflector Gp-Snowblower
| 03***55 | Locknut; (5/16-18-Thd)(Marked X) | 6 |
| 12***78 | Locknut; (M6x1-Thd) | 2 |
| 13***85 | Rivet-Pop | 7 |
290-8919 Frame Gp-Snowblower
| 1K***72 | Locknut Horn To Guard | 9 |
| 21***75 | Frame As | 1 |
| 21***80 | Impeller As | 1 |
290-8924 Frame Gp-Snowblower
| 1K***72 | Locknut Horn To Guard | 7 |
| 21***82 | Impeller As | 1 |
| 21***83 | Guard As | 1 |
290-8915 Frame Gp-Snowblower
| 1K***72 | Locknut Horn To Guard | 8 |
| 21***22 | Support Group-Work Tool | 2 |
| 21***23 | Frame As | 1 |
213-7222 Support Gp-Work Tool
| 21***22 | Support Group-Work Tool | 1 |
| 28***93 | Tube As | 1 |
| 28***97 | Pad As; (Stabilizer) | 1 |
Hydraulic System
283-9595 Cylinder Gp-Hydraulic
| 28***95 | Cylinder Group-Hydraulic | 1 |
| 4K***77 | Nut-Self Locking | 1 |
| 7J***04 | Seal-O-Ring (Id=7.65mm) | 2 |
290-8916 Hydraulic Ar-Snowblower
| 28***95 | Cylinder Group-Hydraulic | 1 |
| 29***16 | Hydraulic Ar-Snowblower | 1 |
| 29***97 | Manifold Group-Control | 1 |
295-4866 Hydraulic Ar-Snowblower
| 28***95 | Cylinder Group-Hydraulic | 1 |
| 29***97 | Manifold Group-Control | 1 |
| 29***66 | Hydraulic Ar-Snowblower | 1 |
295-4867 Hydraulic Ar-Snowblower
| 28***95 | Cylinder Group-Hydraulic | 1 |
| 29***97 | Manifold Group-Control | 1 |
| 29***67 | Hydraulic Ar-Snowblower | 1 |
290-8920 Hydraulic Ar-Snowblower
| 28***95 | Cylinder Group-Hydraulic | 1 |
| 29***20 | Hydraulic Ar-Snowblower | 1 |
| 29***97 | Manifold Group-Control | 1 |
290-8926 Hydraulic Ar-Snowblower
| 28***95 | Cylinder Group-Hydraulic | 1 |
| 29***26 | Hydraulic Ar-Snowblower | 1 |
| 29***97 | Manifold Group-Control | 1 |
295-4871 Lines Gp-Connecting
| 10***03 | Plate-Cover | 1 |
| 14***48 | Fitting As; (Quick Disconnect, Male) | 1 |
| 14***49 | Fitting As; (Quick Disconnect, Female) | 1 |
295-4870 Lines Gp-Connecting
| 10***03 | Plate-Cover | 1 |
| 14***15 | Connector As | 4 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 2 |
295-4872 Lines Gp-Connecting
| 10***03 | Plate-Cover | 1 |
| 14***48 | Fitting As; (Quick Disconnect, Male) | 1 |
| 14***49 | Fitting As; (Quick Disconnect, Female) | 1 |
295-4869 Lines Gp-Connecting
| 10***03 | Plate-Cover | 1 |
| 14***15 | Connector As | 4 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 2 |
295-4868 Lines Gp-Connecting
| 10***03 | Plate-Cover | 1 |
| 14***15 | Connector As | 4 |
| 14***36 | Adapter; (Straight) (-6 Orb X -6 Orfs) | 2 |
295-2597 Manifold Gp-Control
| 10***08 | Kit-Seal; (Solenoid Valve, Quick Steer) | 1 |
| 19***27 | Kit-Seal; (Pressure Reducing Valve) | 1 |
| 19***95 | Valve Group-Solenoid; (Swing/Extension) | 2 |
227-5510 Motor Gp-Gerotor
| 17***46 | Kit-Seal | 1 |
| 22***10 | Motor Group-Gerotor | 1 |
213-7192 Motor Gp-Gerotor
| 17***46 | Kit-Seal | 1 |
| 21***92 | Motor Group-Gerotor | 1 |
| 22***72 | Key | 1 |
227-5496 Motor Gp-Gerotor
| 17***46 | Kit-Seal | 1 |
| 22***96 | Motor Group-Gerotor | 1 |
| 3J***54 | Packing,Preformed Part Of Kit P/N 5r***27 | 1 |
216-0795 Motor Gp-Gerotor
| 17***46 | Kit-Seal | 1 |
| 21***95 | Motor Group-Gerotor | 1 |
| 22***72 | Key | 1 |
212-4589 Motor Gp-Gerotor
| 17***46 | Kit-Seal | 1 |
| 21***89 | Motor Group-Gerotor | 1 |
| 22***72 | Key | 1 |
212-4588 Motor Gp-Gerotor -Auger, 67-In
| 17***46 | Kit-Seal | 1 |
| 21***88 | Motor Group-Gerotor; -Auger, 67-In | 1 |
212-4587 Motor Gp-Gerotor -Deflector
| 1B***14 | Key-Woodruff | 1 |
| 1G***32 | Kit-Seal | 1 |
| 21***87 | Motor Group-Gerotor; -Deflector | 1 |
179-9223 Valve Gp-Check
| 17***23 | Valve Group-Check; -Steering Pump | 1 |
| 3J***07 | Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve | 1 |
| 4J***77 | Seal - O - Ring (11.23mm Od) | 1 |
Service Equipment And Supplies
261-4423 Plate & Film Gp
| 12***56 | Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare) | 1 |
| 15***62 | Film-Information; (Tie-Down Location) | 2 |
| 22***45 | Film-Warning; (Crush Hazard, Stay Back) | 2 |
290-8927 Plate & Film Gp
| 12***56 | Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare) | 1 |
| 15***62 | Film-Information; (Tie-Down Location) | 2 |
| 22***45 | Film-Warning; (Crush Hazard, Stay Back) | 2 |
261-4426 Plate & Film Gp
| 12***56 | Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare) | 1 |
| 15***62 | Film-Information; (Tie-Down Location) | 2 |
| 22***45 | Film-Warning; (Crush Hazard, Stay Back) | 2 |
290-8917 Plate & Film Gp
| 12***56 | Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare) | 1 |
| 15***62 | Film-Information; (Tie-Down Location) | 2 |
| 22***45 | Film-Warning; (Crush Hazard, Stay Back) | 2 |
290-8921 Plate & Film Gp
| 12***56 | Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare) | 1 |
| 15***62 | Film-Information; (Tie-Down Location) | 2 |
| 22***45 | Film-Warning; (Crush Hazard, Stay Back) | 2 |
Work Tool Arrangement
286-0725 Snowblower Ar -73-In
| 28***90 | Bracket, Wiring Group-Work Tool | 1 |
| 28***25 | Snowblower Ar; -73-In | 1 |
| 29***14 | Drive Group-Snowblower | 1 |
286-0726 Snowblower Ar -85-In
| 28***90 | Bracket, Wiring Group-Work Tool | 1 |
| 28***26 | Snowblower Ar; -85-In | 1 |
| 29***18 | Drive Group-Snowblower | 1 |
286-0724 Snowblower Ar -67-In
| 28***90 | Bracket, Wiring Group-Work Tool | 1 |
| 28***24 | Snowblower Ar; -67-In | 1 |
| 29***23 | Drive Group-Snowblower | 1 |
286-0728 Snowblower Ar -85-In
| 26***19 | Wiring Group-Work Tool | 1 |
| 26***26 | Plate & Film Group | 1 |
| 28***28 | Snowblower Ar; -85-In | 1 |
286-0727 Snowblower Ar -73-In
| 26***19 | Wiring Group-Work Tool | 1 |
| 26***23 | Plate & Film Group | 1 |
| 28***27 | Snowblower Ar; -73-In | 1 |
Work Tools
290-8914 Drive Gp-Snowblower
| 01***41 | Setscrew-Socket | 2 |
| 02***87 | Fitting-Grease; (Universal Joint) | 2 |
| 21***44 | Sprocket Group; (16-Teeth, Impeller) | 1 |
294-7388 Drive Gp-Snowblower
| 01***41 | Setscrew-Socket | 2 |
| 02***87 | Fitting-Grease; (Universal Joint) | 2 |
| 21***44 | Sprocket Group; (16-Teeth, Impeller) | 1 |
290-8918 Drive Gp-Snowblower
| 01***41 | Setscrew-Socket | 2 |
| 02***87 | Fitting-Grease; (Universal Joint) | 2 |
| 21***44 | Sprocket Group; (16-Teeth, Impeller) | 1 |
290-8923 Drive Gp-Snowblower
| 01***41 | Setscrew-Socket | 2 |
| 02***87 | Fitting-Grease; (Universal Joint) | 2 |
| 21***44 | Sprocket Group; (16-Teeth, Impeller) | 1 |
SR117 serial number reference
The PIN/serial plate on the SR117 is riveted to the attachment's main frame or mount plate near the quick-coupler end, since there is no engine compartment on this passive hydraulic tool. Read it as a 3-letter serial prefix followed by a sequential number (e.g. SNB00001); the prefix identifies the parts/manual grouping shared across the SR117/SR118/SR121/SR318/SR321 family, not a model year by itself.
| Prefix | Identifies | Notes |
|---|---|---|
| SNB | SR117 two-stage snow blower attachment (shared serial/parts manual grouping with SR118, SR121, SR318, SR321) | Cat parts and electrical system manual for this snow blower family lists serial range SNB00001-UP covering the SR117 together with siblings SR118, SR121, SR318 and SR321 under one manual grouping. The SR117 is a passive hydraulically driven attachment with no engine or ECM of its own; it runs off the carrier's hydraulic system, fitted to the 216B3, 226B3 and 247B3-class skid steer and compact track loaders. Confirm the exact serial prefix on your unit's plate with a dealer before ordering parts, since the manual groups five models under this single prefix rather than assigning SR117 its own dedicated range. |
Frequently asked questions
What hydraulic flow does the SR117 require?
The SR117 runs on 53-75 L/min (14-20 gpm) from the host carrier's standard-flow auxiliary hydraulic circuit. It carries no engine of its own; the auger and impeller are driven entirely through a chain drive powered by the host machine's hydraulics, so the carrier's rated auxiliary output must match this window before connecting.
What is the SR117's operating weight?
Factory spec sheets list operating weight at 419 kg (924 lb) in the later catalog edition, with an earlier edition citing 404.5 kg (890 lb) for the same model. As a passive work tool it has no fuel, coolant, or engine weight to account for, and no shipping weight is published separately from its assembled operating weight.
What replaced the SR117?
Caterpillar discontinued the SR117 and replaced it with the SR115 in its snow blower lineup. The SR115 carries its own dimensions and hydraulic flow rating rather than duplicating the SR117's specs, so it is not a direct spec-for-spec substitute. For parts on an existing SR117, work from its own serial-prefix parts family (shared with SR118, SR121, SR318, and SR321) rather than SR115 documentation.
What SR117 owners discuss
What wears out first on an SR117, and how do owners keep ahead of it?
Why does a two-stage unit like the SR117 still clog in wet or heavy snow?
The shear pin on the auger keeps breaking — is something wrong?
What causes the discharge chute to bind or stop rotating?
How much maintenance does the chain drive actually need?
What hydraulic flow should the host carrier be putting out for the SR117?
What should I inspect before buying a used SR117?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific SR117 part?
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