STANLEY SK58 HYDRAULIC SINKER DRILL

SAFETY SYMBOLS

Safety symbols and signal words are used to emphasize actions that, if not strictly followed, could result in a life-threatening situation, bodily injury, or damage to equipment.

• Safety Alert Symbol: Used to alert to potential personal injury hazards. Obey all safety messages following this symbol to avoid possible injury or death.
• DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. ⚠️
• WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. ❗
• CAUTION: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. ⚠️
• CAUTION (Signal Word): Indicates a potentially hazardous situation which, if not avoided, may result in property damage.
• NOTICE: Indicates a situation which, if not avoided, will result in damage to the equipment. ℹ️
• IMPORTANT: Indicates a situation which, if not avoided, may result in damage to the equipment. ⭐

Always observe safety symbols for your safety and the protection of the tool.

LOCAL SAFETY REGULATIONS

Enter any local safety regulations here. Keep these instructions in an area accessible to the operator and maintenance personnel.

SAFETY PRECAUTIONS

Tool operators and maintenance personnel must comply with the safety precautions given in this manual and on the stickers and tags attached to the tool and hose. Review these precautions carefully before operating the tool or performing maintenance/repairs.

Supervising personnel should develop additional precautions relating to the specific work area and local safety regulations.

The SK58 Hydraulic Sinker Drill will provide safe and dependable service if operated in accordance with this manual. Read and understand this manual and any stickers/tags before operation. Failure to do so could result in personal injury or equipment damage.

• Operator must work in an area without bystanders and be familiar with prohibited work areas like excessive slopes and dangerous terrain.
• Establish a training program for all operators to ensure safe operation.
• Do not operate the tool unless thoroughly trained or under supervision.
• Always wear safety equipment: goggles (?), ear protection (?), head protection, and safety shoes (?) at all times.
• Do not inspect or clean the tool while the hydraulic power source is connected. Accidental engagement can cause serious injury.
• Supply hoses must have a minimum working pressure rating of 2500 psi/175 bar.
• Ensure all hose connections are tight.
• The hydraulic circuit control valve must be in the "OFF" position when coupling or uncoupling the tool. Wipe all couplers clean before connecting, using only lint-free cloths. Failure to do so may result in damage to quick couplers and overheating of the hydraulic system.
• Do not operate the tool at oil temperatures above 140 °F/60 °C. Higher temperatures can cause operator discomfort and damage the tool.
• Do not operate a damaged, improperly adjusted, or incompletely assembled tool.
• Do not weld, cut with an acetylene torch, or hardface the tool bit.
• All tool repair, maintenance, and service must only be performed by authorized and properly trained personnel.
• Do not exceed the rated limits of the tool or use it for applications beyond its design capacity.
• Always keep critical tool markings, such as labels and warning stickers, legible.
• Always replace parts with STANLEY-recommended replacement parts.
• Check fastener tightness often and before each use daily.
• Do not operate the tool if underground utilities are present.
• Do not wear loose fitting clothing when operating the tool.

WARNING: Some dust created by construction activities may contain chemicals known to cause cancer, birth defects, or other reproductive harm (e.g., lead, crystalline silica, arsenic, chromium). Reduce exposure by working in a well-ventilated area and using approved safety equipment like dust masks. Research materials being cut and follow safety procedures and regulations.

TOOL STICKERS & TAGS

The information listed on the stickers shown must be legible at all times. Replace decals if they become worn or damaged. Replacements are available from your local STANLEY Distributor.

CAUTION Sticker: Specifies operating parameters like flow rate (7-9 GPM/26-34 LPM) and pressure (DO NOT EXCEED 2000 PSI/140 BAR). Warns against exceeding specified flow or pressure, using incorrect center systems (closed vs. open), improper hose connection, and potential oil injection injury from leaks.

SK58 Name Tag: Identifies the model as SK58 and provides manufacturer details (Stanley Hydraulic Tools, Milwaukie, Oregon, U.S.A.).

GPM Sticker: Indicates flow rate.

Safety Tag (P/N 15875): Attached to the tool when shipped. Contains critical safety instructions regarding hydraulic hose use near electrical lines, potential for oil injection from leaks or bursts, proper hose connection, avoiding bystanders, and requiring authorized personnel for service.

IMPORTANT Tags: Instruct users to read the operation manual and safety instructions before use and to use only STANLEY-approved parts and procedures. The tag should only be removed by the tool operator.

HOSE TYPES

Hydraulic hose working pressure must be equal to or higher than the system's relief valve setting. STANLEY authorizes three types of hydraulic hose:

• Certified non-conductive: Constructed with thermoplastic or synthetic rubber inner tube, synthetic fiber braid reinforcement, and a weather-resistant cover. Labeled "certified non-conductive" and is the only type authorized for use near electrical conductors.
• Wire-braided (conductive): Constructed with synthetic rubber inner tube, single or double wire braid reinforcement, and a weather-resistant synthetic rubber cover. This hose is conductive and must never be used near electrical conductors.
• Fabric-braided (not certified or labeled non-conductive): Constructed with thermoplastic or synthetic rubber inner tube, synthetic fiber braid reinforcement, and a weather-resistant cover. Not certified non-conductive and must never be used near electrical conductors.

HOSE SAFETY TAGS: DANGER tags are attached to all STANLEY-purchased hose and must not be removed. These tags provide critical safety information regarding electrical hazards, hose integrity, and proper handling. If a tag is illegible, replace it immediately.

HOSE RECOMMENDATIONS

The chart below shows recommended minimum hose diameters for various hose lengths based on flow rate (GPM/LPM) to maintain acceptable return line pressure for optimal tool performance. All hydraulic hose must meet or exceed SAE J517 specifications and have a working pressure rating equal to the maximum hydraulic system relief valve setting.

Figure 1. Typical Hose Connections: Illustrates the flow direction for pressure and return hoses connecting to the tool and hydraulic circuit.

HTMA / EHTMA REQUIREMENTS

The following tables detail the Hydraulic Tool Manufacturers Association (HTMA) and Equipment & Hydraulic Tool Manufacturers Association (EHTMA) requirements for hydraulic systems used with STANLEY tools.

HTMA HYDRAULIC SYSTEM REQUIREMENTS

*SSU = Saybolt Seconds Universal

Note: Do not operate the tool at oil temperatures above 140° F (60° C). Operation at higher temperatures can cause operator discomfort.

Note: When choosing hydraulic fluid, consider expected oil temperature extremes. Hydraulic fluids with a viscosity index over 140 meet requirements over a wide range of operating temperatures.

EHTMA HYDRAULIC SYSTEM REQUIREMENTS

Note: These are general hydraulic system requirements. See tool specification page for tool specific requirements.

OPERATION

Hose Size: Recommended hose size is .500 inch/12 mm I.D. up to 50 ft/15 m long, and .625 inch/16 mm I.D. minimum up to 100 ft/30 m.

PRE-OPERATION PROCEDURES

CHECK POWER SOURCE:

1. Using a calibrated flow meter and pressure gauge, verify the hydraulic power source develops 7-9 GPM/26-34 LPM at 1500-2000 psi/105-140 bar.
2. Ensure the hydraulic power source has a relief valve set to open at 2100-2250 psi/145-155 bar maximum.

INSTALL DRILL STEEL & ROCK BIT:

Use standard 4-1/4 inch shank x 1 inch hex drill steel for SK58110, SK58120, and SK58310 models, and 4-1/4 inch shank x 7/8 inch hex drill steel for the SK58130 model. Drill steels are available in various lengths; start with a short length for normal standing operation. Tool handles should not exceed chest height.

1. Thread a rock bit onto the drill steel.
2. Rotate the latch (61) out and up.
3. Slide the drill steel into the tool.
4. Rotate the latch down carefully, avoiding pinching fingers. The collar on the drill steel should be above the bottom of the latch when correctly installed.

CONNECT HOSES:

1. Wipe all hose couplers with a clean, lint-free cloth before connecting.
2. Connect hoses from the hydraulic power source to the tool fittings or quick disconnects. Connect return hoses first and disconnect them last to minimize trapped pressure.
3. Observe flow indicators on hose couplers to ensure proper fluid direction. The female coupler on the tool hose is the inlet.
4. Move the hydraulic circuit control valve to the ON position to operate the tool.
5. Connect the air supply hose to the tool.

Note: If uncoupled hoses are left in the sun, pressure may increase, making them difficult to connect. Connect free ends together.

Air Supply Notice: The air supply must be a minimum of 30 cfm at 120 psi. Insufficient air can lead to inadequate rock cutting extraction, tool damage, reduced drilling time, and premature drill bit wear.

OPERATION PROCEDURES:

1. Observe all safety precautions.
2. Install the appropriate tool bit.
3. Start the hydraulic supply and turn the circuit control valve to ON.
4. Open the air valve on the tool slightly to permit a small amount of air flow from the tool bit. Note: Air flow must be continuous during drilling to avoid clogging and back-flushing of waste products.
5. Place the bit firmly on the surface to be drilled.
6. Open the hydraulic valve lever slightly for slow speed. Adequate down pressure is crucial.
7. Ensure the rock bit rotates at a moderate speed. Start holes with slow impact and rotation to carve a depression. If the bit doesn't rotate, open the hydraulic valve further or adjust the motor control knob.
8. Once a depression is carved, open the hydraulic valve lever fully. Readjust the motor control knob for good drilling speed and adjust the air valve to ensure cuttings are extracted.
9. When the tool is within 6 inches of the drill hole bottom, add another drill steel section or replace with a longer one. Close the hydraulic valve lever, leave the air valve ON, and lift the tool and bit out of the hole. Keeping the air valve ON prevents cuttings from falling around the bit.
10. When the tool, drill steel, and bit are removed, turn the valve lever OFF and turn the hydraulic supply circuit control valve OFF before changing the drill steel or rock bit.

COLD WEATHER OPERATION: Preheat hydraulic fluid at low engine speed. Fluid temperature should be at or above 50 °F/10 °C (400 ssu/82 centistokes) before use. Using fluid that is too thick can damage the hydraulic system or breaker.

TOOL PROTECTION & CARE

In addition to safety precautions, observe the following for equipment protection and care:

• Wipe all couplers clean before connection.
• Ensure the hydraulic circuit control valve is OFF when coupling/uncoupling tools to prevent damage to quick couplers and overheating.
• Store the tool in a clean, dry space, safe from damage or pilferage.
• Connect the PRESSURE hose (male quick disconnect) to the "IN" port and the RETURN hose (female quick disconnect) to the opposite port. Do not reverse circuit flow, as this can damage internal seals.
• Always replace hoses, couplings, and parts with STANLEY-recommended parts. Supply hoses must have a minimum working pressure rating of 2500 psi/172 bar.
• Do not exceed the rated flow; rapid failure of internal seals may result. Refer to Specifications for correct flow rate and model number.
• Keep critical tool markings, such as warning stickers and tags, legible.
• Keep tool bits sharp for maximum drilling performance. Ensure bits are not chipped or rounded on the striking end.
• Never operate a hammer drill without a tool bit or without holding it against the work surface.
• Tool repair should be performed only by experienced personnel.
• Ensure recommended relief valves are installed in the pressure side of the system.
• Do not use the tool for unintended applications.

TROUBLESHOOTING

MAINTENANCE

ACCUMULATOR TESTING PROCEDURE:

Required equipment: 31254 Charge Kit (Accumulator Tester P/N 02835, Charging Assembly P/N 15304, NITROGEN bottle).

1. Remove valve cap assembly from sinker drill.
2. Remove protective cap and loosen 5/8-inch hex locking nut on tool charging valve 1-1/2 turns.
3. Turn Accumulator Tester gauge fully counterclockwise to retract the stem.
4. Thread tester onto the accumulator charging valve, hand-tightening the chuck.
5. Advance tester valve stem clockwise until pressure reads 600-700 psi/42-48 bar.
6. If pressure is OK, unscrew gauge-end to retract stem, then remove tester. If pressure is low, proceed to charging procedure.
7. Tighten 5/8-inch hex locking nut, install protective cap and valve cap assembly.

ACCUMULATOR CHARGING:

1. Perform steps 1-4 of the accumulator testing procedure.
2. Connect charging assembly chuck to the accumulator tester's charging valve or directly to the tool's charging valve.
3. Adjust regulator to 600 psi/42 bar charging pressure. (May need 650-700 psi/45-48 bar to overcome pressure drop).
4. Open valve on charging assembly hose.
5. When charged, close the charging assembly hose valve and remove the chuck.
6. If tester was used, turn its gauge-end fully counterclockwise before removing.
7. Tighten 5/8-inch hex locking nut and replace protective cap.
8. Replace valve cap assembly.

Figure 2. Charging the Accumulator: Diagram showing the accumulator charge kit components and connection for charging.

UNDERWATER MODEL MAINTENANCE:

After each use, flush movable parts exposed to water with a water-displacing oil (e.g., WD40™). Remove water and debris:

1. Turn tool upside down (without bit) and spray oil through the drive hex to displace water in the lower cavity.
2. Dip or spray the entire tool.
3. Cycle the tool hydraulically several times before storing.

GENERAL SERVICE NOTES:

1. If repainting after servicing, mask off the vent in the valve cap assembly. Do not allow paint into IN/OUT ports or foot assembly bore.
2. Handle Grips Replacement: Remove old grips, clean handle. Wash new grips and handle, then push or drive them on. Do not lubricate; grips may not be secure if grease or oil is used.

SPECIFICATIONS

• Shank Size: SK58110 Air, SK58120 Water, SK58310 UW Air: 4-1/4 in. x 1 in. Hex; SK58130 Air: 4-1/4 in. x 7/8 in. Hex
• Pressure Range: 1500-2000 psi/105–140 bar
• Flow Range: 7-9 GPM / 26-34 LPM
• Optimum Flow: 8 GPM / 30 LPM
• Maximum Back Pressure: 250 psi / 17 bar
• Connect Size & Type: 3/8 in. Male Pipe Adapter
• Weight: 67 lbs / 30 kg
• Length: 26 in. / 66 cm
• Width: 18 in. / 46 cm
• Hose Whips: Included
• Port Size: -8 SAE O-ring
• Air Supply: Minimum 30 cfm @ 120 psi

VIBRATION DECLARATION (SK58310 MODELS):

• Declared Vibration Emission Value (ISO-28927-10 2011, EN 12096):
• 3-AXIS MEASURED: 17.7 M/SEC² (Uncertainty K: 1.4 M/SEC²); WITH UNCERTAINTY: 19.1 M/SEC²
• Z-AXIS MEASURED: 16.0 M/SEC² (Uncertainty K: 1.2 M/SEC²); WITH UNCERTAINTY: 17.2 M/SEC²

ACCESSORIES

DRILL STEELS FOR USE WITH AIR

• 1 in. Hex x 4-1/4 in. H Thread, 24 in. / 61 cm UC: 05170
• 1 in. Hex x 4-1/4 in. H Thread, 36 in. / 91 cm UC: 04915
• 1 in. Hex x 4-1/4 in. H Thread, 48 in. / 122 cm UC: 05171
• 7/8 in. Hex x 4-1/4 in. H Thread, 24 in. / 61 cm UC: 05174

CARBIDE ROCK BITS FOR USE WITH AIR (SHOULDER DESIGN)

• 1-3/8 in. Diameter H Thread: 05177
• 1-1/2 in. Diameter H Thread: 05178

UC denotes dimension measured from bottom tip of tool to bottom surface of collar.

SERVICE TOOLS

• O-ring Tool Kit: 04337
• Accumulator Disassembly Tool: 05508
• Accumulator Cylinder Puller: 05640
• Split Rings: 04908
• Flow Sleeve Removal Tube: 04910
• Bearing Installation Tool: 05044
• Bearing Installation Tool: 05061
• Latch Removal Tool: 05045
• Latch Installation Tool: 05879
• Collet, 7/8 in.: 05871
• Latch Installation Tool: 05062
• Flow Sleeve Kit (See page 19 for parts included in kit): 74397

SK58 PARTS ILLUSTRATION

This section provides a detailed exploded view diagram of the SK58 Hydraulic Sinker Drill, illustrating the arrangement and numbering of all components for identification and assembly/disassembly reference.

SK58 PARTS LIST

The following tables list all parts for the SK58 Hydraulic Sinker Drill, including part numbers, quantities, and descriptions. This list is essential for ordering replacement parts and understanding the tool's construction.

Shank Sizes: SK58110 - 1 INCH x 4-1/4 HEX SHANK AIR; SK58120 - 1 INCH x 4-1/4 HEX SHANK WATER; SK58130 - 7/8 INCH x 4-1/4 HEX SHANK AIR; SK58310 - 1 INCH x 4-1/4 HEX SHANK AIR, UNDERWATER USE.

Coupler Sets: P/N-03971 (Items 105 & 106) for SK58110, SK58130, SK58310. P/N-88685 (Items 105 & 106) for SK58120.

Note: Use part number and part name when ordering. * DENOTES PART OF SEAL KIT P/N 04805.

UNDERWATER TOOLS DEPTH GUIDELINE

UNDERWATER MODELS ONLY

CAUTION: Do not use hydraulic tools underwater that are not designated as an "underwater" model, as this will result in damage to the tool.

Underwater hydraulic tool applications are categorized by tool type and method of operation into four quadrants.

Tools are either percussive or rotational. Percussive tools require the nitrogen accumulator PSI to counteract ambient pressure at lower depths, limiting their operational depth. Rotational tools, lacking accumulators, can operate at greater depths.

Operation methods include diver operated or remote operated vehicle (ROV). ROVs, with depth-compensated hydraulic power sources, can reach thousands of feet. Percussive tool depth limitations apply regardless of operation method.

OPERATION OVERVIEW

RECOMMENDED HOSE DIAMETERS