County Line Log Splitter Parts Diagram: 2026 Repair
The County Line log splitter parts diagram illustrates the full hydraulic system layout, linking a 10.5 GPM to 16 GPM 2-stage pump, control valve assembly, and 4-inch to 5-inch hydraulic cylinder. It details structural beam pin locations, high-pressure 3,000 PSI hose configurations, suction filters, and engine mounting setups for efficient assembly and repair.
📌 Key Takeaways
- Identifies 2-stage hydraulic pumps (10.5 to 16 GPM) rated for 3,000 PSI maximum operating pressure.
- Maps hose pinout configuration between auto-return control valve, cylinder ports, and hydraulic oil reservoir.
- Specifies torque specs for main wedge beam pivot bolts (120-150 ft-lbs) and pump mount adapter housing.
- Highlights common wear items like hydraulic suction strainers, cylinder piston seals, and control valve detent springs.
- Distinguishes between simple seal/hose DIY replacements and professional hydraulic cylinder rebuilds or pump replacements.
CountyLine log splitters, distributed primarily by Tractor Supply Company and manufactured by Special Products Company (SpeeCo), rely on a robust hydraulic and mechanical architecture to deliver 25 to 40 tons of splitting force. Understanding the county line log splitter parts diagram is essential for equipment operators, technicians, and mechanics performing routine maintenance, hydraulic system overhauls, or structural repairs. This technical guide breaks down the structural schematic, fluid dynamic pathways, mechanical drive couplings, and component specifications across standard 25-ton, 30-ton, and 35-ton configurations, providing exact operational parameters, torque specifications, and system diagnostics.
County Line Log Splitter Parts Diagram: Hydraulic and Structural Components
The operational framework of a modern CountyLine log splitter is divided into three core subsystems: the primary power unit, the high-pressure hydraulic circuit, and the structural chassis assembly. The county line log splitter parts diagram below details how these individual sub-assemblies interface during operational load cycles.
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According to OEM specs, the mechanical drive begins at the internal combustion engine (typically a Kohler SH265 196cc, Kohler CH395 277cc, or LCT 208cc engine depending on tonnage rating). The engine shaft connects directly to a two-stage hydraulic pump via a flexible jaw coupler (Lovejoy type) enclosed within a bellhousing mount. Understanding this mechanical linkage is critical when diagnosing rotational vibration or shaft alignment errors.
When servicing the drive coupling illustrated in the layout diagram, always maintain a 1/16-inch (1.5mm) clearance gap between the engine shaft jaw hub and the pump shaft jaw hub to prevent axial thrust loads from damaging the hydraulic pump shaft seals.
1. Hydraulic Cylinder and Splitting Wedge Assembly
The hydraulic cylinder converts hydraulic fluid pressure into linear force. Standard 25-ton models feature a 4.0-inch inner diameter (ID) bore cylinder with a 24-inch stroke and a 1.75-inch solid steel rod. The 30-ton and 35-ton variants utilize 4.5-inch and 5.0-inch bore cylinders, respectively. The cylinder is anchored to the main steel I-beam frame using heavy-duty clevis pins retained by bridge pins. The rod end connects to the high-carbon steel splitting wedge, which glides along the machined top flange of the beam on replaceable brass or composite wear strips.
2. Two-Stage Hydraulic Gear Pump Assembly
The heart of the fluid displacement system is a hi-lo two-stage hydraulic pump (commonly rated at 11 GPM for 25-ton models and 16 GPM for 30/35-ton models). Stage one utilizes a large displacement gear setup operating at low pressure (up to 650 PSI) to rapidly advance the cylinder rod toward the log. When resistance is met, an internal unloader valve shifts fluid delivery to stage two—a small displacement gear setup operating at high pressure (up to 3,200–3,500 PSI)—maximizing splitting tonnage.
3. Directional Control Valve with Auto-Return Detent
Mounted near the operator station, the three-position, four-way directional control valve governs cylinder extension, neutral bypass, and cylinder retraction. The valve incorporates an adjustable main system pressure relief valve set from the factory at 3,200 PSI, as well as an auto-return detent mechanism. When the control lever is pulled into the return position, an internal spring-loaded detent ball locks the spool in place until the cylinder fully retracts. The resulting hydraulic pressure spike (approximately 800–1,000 PSI) trips the internal kick-out mechanism, returning the lever to neutral automatically.
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4. Hydraulic Reservoir and Filtration Layout
The main structural tongue or frame tube doubles as the hydraulic fluid reservoir, holding between 3.5 to 6.5 gallons of fluid depending on overall system capacity. Fluid flows from the tank through a 100-mesh suction strainer submerged near the bottom of the reservoir, into the pump inlet hose, and returns through a spin-on 10-micron hydraulic return filter (typically thread size 3/4-16 UNF or 1-12 UNF). Maintaining clean fluid through this closed loop prevents spalling within the pump gears and scoring on the cylinder wall.
How to Interpret the Log Splitter System Blueprint and Fluid Layout
Reading a technical schematic or system overview requires tracing fluid pathways, identifying control ports, and recognizing mechanical fasteners. When analyzing a county line log splitter parts diagram, hydraulic lines are represented by specific line types and port designations etched into the valve body and pump housing.
Never inspect pressurized hydraulic lines using bare hands. High-pressure hydraulic fluid injection injuries can occur at pressures as low as 100 PSI. Always use a piece of cardboard or wood when checking for micro-pinhole leaks along high-pressure lines.
Tracing Hydraulic Fluid Lines
To accurately interpret the hydraulic schematic, follow the fluid cycle starting from the reservoir base:
- Suction Line (Low Pressure/Vacuum): Connects the base of the tank (suction port) to the inlet port of the two-stage pump. This line is reinforced wire-braided suction hose (typically 3/4-inch or 1-inch ID) secured with double hose clamps to prevent cavitation.
- High-Pressure Supply Line: Extends from the pump outlet to the directional control valve port labeled “P” (Pressure). This is a 1/2-inch ID wire-braided 4,000 PSI working pressure hose with crimped female JIC swivel fittings.
- Cylinder Work Lines (A & B Ports): Line Port A routes fluid to the cylinder rear base port (extending the wedge). Line Port B connects valve output to the cylinder rod end port (retracting the wedge).
- Return Line (Low Pressure): Connects the valve port labeled “T” (Tank/Return) to the inlet side of the spin-on 10-micron filter head mounted atop the reservoir.
For more detailed information on fluid power schematics, consult our comprehensive hydraulic pump troubleshooting guide to verify pump displacement characteristics and bypass pressure settings.
Interpreting Valve Port Designations and Fastener Callouts
When replacing components shown on the layout blueprint, pay careful attention to thread types. CountyLine units utilize a mixture of National Pipe Taper (NPT), Joint Industry Council (JIC 37° flare), and SAE Straight Thread O-Ring (ORB) fittings. Installing an NPT fitting into an ORB port will permanently damage the valve casting. For structural bolt replacements, always consult the hardware callout chart to match bolt grades; structural beam fasteners require Grade 8 minimum, while sheet metal guards utilize Grade 5 bolts.
County Line Log Splitter Part Numbers and Component Torque Specs
The following reference table outlines standard specifications, replacement OEM part numbers (manufactured by SpeeCo/YTL and distributed by Tractor Supply), and tightening torques across standard CountyLine log splitter models. Refer to this data when executing component teardowns or routine servicing.
| Component Description | OEM / Service Part # | Technical Specification | Torque / Operating Spec |
|---|---|---|---|
| 2-Stage Hydraulic Pump (25-Ton) | N780-0500 / 712-0400 | 11 GPM, 3/2-inch Inlet, 1/2-inch NPT Outlet | Mounting Bolts: 18–22 ft-lbs |
| 2-Stage Hydraulic Pump (30/35-Ton) | N780-0900 / 712-0700 | 16 GPM, 1-inch Inlet, 1/2-inch NPT Outlet | Mounting Bolts: 18–22 ft-lbs |
| Auto-Return Control Valve | SpeeCo 710-0100 / YTL-007-882 | 3-Way 4-Position, 3,200 PSI Relief, Detent Kickout | Relief Screw: Factory Set (3,200 PSI) |
| Hydraulic Cylinder (25-Ton) | C40240-10C / 715-0100 | 4.0″ Bore x 24″ Stroke, 1.75″ Rod, Clevis Mount | Clevis Pins: Retained with R-Clips |
| Hydraulic Return Line Filter | HF6510 / SpeeCo 711-0100 | 10 Micron Spin-On, 3/4-16 UNF Thread | Hand Tight + 3/4 Turn |
| Lovejoy Flexible Coupling Spider | L-090 / L-095 BUNA-N | Rubber Insert, Jaw Coupling 1/2″ x 3/4″ Bore | Setscrews: 7.5–9 ft-lbs (Loctite 242) |
| Wedge Guide Wear Plates | SL-030-B / SpeeCo 718-0200 | Brass / Ultra-High-Molecular-Weight Polyethylene | Retainer Bolts: 12–15 ft-lbs |
System Fluid Capacity: 10W AW-32 Hydraulic Fluid for standard operating climates (above 32°F / 0°C). Use ISO VG 22 or DEXRON III Automatic Transmission Fluid (ATF) for consistent operation in sub-zero winter ambient conditions. System capacity ranges from 4.0 to 6.5 gallons total fluid volume.
Troubleshooting Common Issues via the County Line Log Splitter Schematic
When functional anomalies occur, using the county line log splitter parts diagram as a diagnostic blueprint allows technicians to isolate root causes without replacing functioning components unnecessarily. Below are step-by-step diagnostic workflows for common performance failures.
System Lacks Splitting Force (Cylinder Stalls Under Load)
If the engine continues running smoothly but the ram stops moving when contacting hardwood, the system is failing to build high-stage hydraulic pressure. Trace the schematic to isolate these potential failure points:
- Low Main Relief Pressure: The main pressure relief valve inside the control casting may be bypassing oil back to the tank prematurely. Connect a 0–5,000 PSI pressure gauge in-line between the pump outlet and valve inlet port P. Actuate the valve to deadhead the cylinder. If pressure reads below 3,200 PSI, adjust the internal relief screw clockwise in 1/4-turn increments until 3,200–3,300 PSI is attained.
- Unloader Valve Stuck Open: The two-stage pump’s internal kick-down check valve may have ingested debris, locking the pump in the low-pressure/high-volume first stage (650 PSI maximum). Remove the unloader plug on the side of the pump housing, clean the shuttle ball, and re-torque to spec.
- Bypassing Cylinder Piston Seal: Fluid may be slipping past the piston seals inside the cylinder barrel. Extend the cylinder midway, stop the engine, disconnect the return hose from the rod-end cylinder port, cap the hose, and restart the engine. Actuate the control lever to extend. If continuous fluid streams out of the open rod-end port, the piston seals are blown and require rebuilding. See our log splitter valve adjustment manual for detailed spool teardown procedures.
Slow Wedge Cycle Speed or Erratic Cylinder Movement
If the cylinder stutters during movement or takes longer than the factory rating (typically 10.5 to 14 seconds full stroke), the primary cause is suction side aeration or low displacement volume:
- Suction Air Leaks: Aeration occurs when air enters the system on the low-pressure side of the pump. Inspect the suction hose barb fittings on the reservoir tank output and pump inlet. Tighten hose clamps and inspect for cracks or wall collapse in the suction line. Air entering the pump causes hydraulic fluid foaming inside the tank.
- Clogged Suction Strainer: Over time, metal particles or breakdown sludge can clog the 100-mesh suction strainer positioned inside the tank outlet. Drain fluid, unscrew the suction fitting from the tank wall, flush the strainer mesh with solvent, and reinstall.
Auto-Return Detent Fails to Lock or Disengage
If the valve lever will not stay locked in the return position, or if it fails to automatically kick back to neutral when the wedge reaches full stroke, consult the control valve exploded assembly schematic:
- Lever Will Not Lock into Retract: Check the detent spring and steel ball retention assembly beneath the rear end cap of the control valve. Adjust the detent spring tension plug clockwise to increase ball holding force on the valve spool detent groove.
- Lever Fails to Kick Out at End of Stroke: The kick-off pressure threshold is set too high, or the cylinder stroke limit is not triggering a sufficient backpressure spike. Turn the detent adjustment screw counter-clockwise in 1/2-turn increments until the lever pops into neutral precisely when the cylinder completes its retraction stroke. Refer to our guide on engine maintenance schedules to verify shaft RPM output, as low engine idle speed can also cause low detent pressure kick-out performance.
Frequently Asked County Line Log Splitter Configuration Questions
How do I identify the exact hydraulic pump GPM on my CountyLine splitter?
To determine pump rating, locate the stamped part number on the flat aluminum face of the pump housing or check engine horsepower specs on the county line log splitter parts diagram tag. Generally, 6.5 HP (196cc/208cc) engines are paired with an 11 GPM pump featuring a 3/4-inch inlet barb. Models with 9.5 HP or larger engines (277cc/301cc) use a 16 GPM pump fitted with a 1-inch inlet barb. You can also measure the pump gear housing thickness; 11 GPM housings measure approximately 2.75 inches, while 16 GPM housings measure 3.5 inches.
What oil type and capacity are recommended in the CountyLine layout schematic?
CountyLine schematics specify 10W non-foaming Anti-Wear hydraulic oil (AW-32 or AW-46). For operations consistently taking place in freezing temperatures below 32°F (0°C), universal automatic transmission fluid (ATF DEXRON III) is recommended to prevent pump cavitation caused by cold fluid viscosity. Standard 25-ton reservoirs take approximately 4.5 gallons to reach the top mark on the dipstick/sight glass, while 30-ton and 35-ton frame tanks hold up to 6.5 gallons total system volume.
How do I adjust or replace the auto-return control valve detent?
To adjust the auto-return detent pressure, remove the silver aluminum protective cap on the back of the Energy or SpeeCo directional control valve. Inside, you will find an Allen head set screw locking a hex adjustment plug. Loosen the set screw, then turn the hex plug clockwise to increase detent holding force (if the lever slips out early) or counter-clockwise to decrease detent kick-out pressure (if the lever hangs up when the cylinder fully retracts). If adjusting the plug yields no change, unbolt the end assembly and check for a broken internal detent spring or rusted detent balls.
Can I rebuild the hydraulic cylinder seals using the parts diagram breakdown?
Yes. Rebuilding the cylinder requires removing the front gland nut from the barrel. Extend the rod halfway, unscrew the gland retainer or pin lock, pull the rod and piston assembly out of the cylinder tube, and unscrew the main piston locknut from the rod end. Replace the inner rod U-cup seal, outer rod wiper, piston wear rings, and double-acting piston seal rings supplied in the OEM cylinder rebuild seal kit (e.g., SpeeCo Part # 715-0100-SK). Always coat new seals with clean AW-32 hydraulic oil before sliding them over thread edges to avoid nicking the seal lips.
Why is hydraulic fluid leaking from the breather cap on the structural reservoir?
Hydraulic fluid escaping from the frame tank breather cap usually indicates severe oil aeration or overfilling. If air enters the suction side of the system (e.g., loose suction hose clamps or a damaged pump shaft seal), the air mixes with the hydraulic oil, causing heavy foam that expands and spills through the tank breather cap. Verify that the fluid level matches the dipstick with the cylinder rod fully retracted, and inspect the suction hose circuit for micro-vacuum leaks.
Step-by-Step Guide to Understanding the County Line Log Splitter Parts Diagram
Identify – Find your County Line log splitter model number and tonnage rating on the frame tag near the engine base.
Locate – Position the component on the visual layout schematic, matching part callout numbers to the OEM replacement index.
Reference – Cross-check the hydraulic hose connection points, noting valve port configurations (Inlet, Outlet, A-Port, B-Port).
Connect/Route – Route hydraulic hoses according to diagram paths, placing thread sealant on NPT fittings while avoiding O-ring boss threads.
Verify – Torque structural beam bolts and pump adapter hardware to manufacturer specifications before filling the hydraulic reservoir.
Troubleshoot – Bleed trapped air from the system by cycling the control valve rod extended and retracted 5 to 10 times without load.
