The provided document is an operator's manual for the Digga Mini Machine Drive, an earthmoving machinery attachment designed for drilling, screw anchoring (pier installation), core barreling, and other high-torque applications.
Function Description
The Digga Mini Machine Drive is a versatile planetary drive unit that attaches to a host machine's tool bar, quick-attach, or hitch mechanism. Its primary function is to provide rotational power for various ground-engaging tasks, such as drilling vertical or horizontal holes and installing screw piles. The unit is designed for high performance and is compatible with different auger hubs and extensions. It can be used with mini loaders and mini excavators, with specific mounting frames available for each.
An essential accessory for screw-pile installation is the Inline Pressure Relief Valve (IRV), which features two dial gauges for measuring supply and return hydraulic pressures and an integrated adjustable relief valve. This allows for precise torque control and prevents damage to screw anchors by bypassing hydraulic flow when a specified pressure/torque is reached. The IRV can be used independently for estimating applied torque or with a calibrated torque measuring system.
The Halo Alignment System, an optional feature, measures the angle of the drive with respect to plumb. It displays a sequence of colors on a circular LED array visible to the operator, indicating when the drive is within 1.5° of plumb (solid green) or off plumb (partially green and red, indicating the direction to maneuver for correction). The Halo system aids in maintaining straight drilling and piling.
Important Technical Specifications
The manual covers models MM-09K, MM-10K, and MM-14K. Key specifications include:
MM-09K:
- Standard Output Shaft: 75mm square
- Theoretical Torque: 11,165 Nm @ 240 bar / 8,235 ft lbf @ 3,500 psi
- Expected Torque (77% Efficiency): 8,597 Nm @ 240 bar / 6,341 ft lbf @ 3,500 psi
- Maximum Power: 25 kW / 33 HP
- Maximum Flow: 115 lpm @ 130 bar / 30 gpm @ 1,900 psi
- Maximum Pressure: 240 bar @ 60 lpm / 3500 psi @ 15 gpm
MM-10K/MM-14K:
- Standard Output Shaft: 2.5" Hex (MM-10K), 75mm square (MM-14K)
- Theoretical Torque: 14,206 Nm @ 205 bar / 10,478 ft lbf @ 3,000 psi
- Expected Torque (77% Efficiency): 10,938 Nm @ 205 bar / 8,040 ft lbf @ 3,000 psi
- Maximum Power: 25 kW / 33 HP
- Maximum Flow: 70 lpm @ 205 bar / 18.5 gpm @ 3,000 psi
- Maximum Pressure: 205 bar @ 70 lpm / 3,000 psi @ 18.5 gpm
Weight and Dimensions (approximate, without Halo, IRV, or other accessories):
- Mini Loader: 131 kg (291 lbs) weight, 613 mm (24.1 in) width, 564 mm (22.2 in) length, 617 mm (24.3 in) height
- Mini Excavator (Hitch Included): 171 kg (380 lbs) weight, 410 mm (16.1 in) width, 667 mm (26.2 in) length, 723 mm (28.4 in) height
- Mini Loader Extended Boom: 196 kg (435 lbs) weight, 613 mm (24.1 in) width, 1530 mm (60.2 in) length, 1379 mm (54.3 in) height
- Gearbox Only: 63 kg (140 lbs) weight, 290 mm (11.4 in) width, 290 mm (11.4 in) length, 612 mm (24.1 in) height
Halo Alignment System:
- Accuracy: ±0.25° repeatability when zeroed against an accurate level.
- Power Options: 12V/24V auxiliary power (cigarette socket) or a custom magnetic battery with a 'zero' switch.
- Battery Life: Approximately 8-9 hours of normal use.
Usage Features
- Auger Installation: The manual details the process of attaching augers, emphasizing compatibility with the drive shaft, proper alignment, and securing with pins and lynch pins. Mechanical assistance is recommended for loads exceeding 55 lbs (25 kg).
- Augering Procedure: The unit is designed for drilling and rotational operation only, not as a lifting device. Operators are instructed to set the host machine's engine at a low RPM to determine the correct control valve position for clockwise (digging) rotation. Auger speed should be adjusted based on soil conditions (high RPM for light/sandy soil, slower for hard/rocky/frozen soils). The 4-way swing (gimbal) allows the auger to self-align vertically.
- Spoil Removal: Instructions include stopping rotation while in the hole, raising the auger vertically, moving away, rotating, and stopping to remove spoil. Rapid forward/reverse engagement for spoil removal is cautioned against as it can create excessive pressure spikes.
- Extension Use: Procedures for installing additional extensions and telescopic auger extensions are provided, emphasizing safety when accessing the auger hub in the hole.
- Screw Anchoring (Pile/Pier): Installation must be performed by trained/certified installers. The process involves connecting approved adapters, installing the pile in one continuous motion to the desired depth and torque, applying sufficient downward pressure, and maintaining a plumb line.
- Cold Weather Startup: For temperatures below 5°C (41°F), the drive should be started slowly under no load at minimum speed to allow warm hydraulic oil to circulate and bring the unit to operating temperature. Load should be introduced gradually.
Maintenance Features
- Low Maintenance Design: The Mini Machine Drive is designed for low maintenance, primarily requiring regular oil changes. It contains no user-serviceable parts, and unauthorized disassembly voids the warranty.
- Oil Change Schedule:
- First Oil Change (Bed-in): Within the first 30 hours (severe use) or 50 hours (moderate use) or 3 months, whichever comes first. Failure to perform this voids the warranty.
- Subsequent Oil Changes: Every 300 hours (extreme use) or 500 hours (moderate use).
- Full Service: Every 12 months by an authorized service agent.
- Gearbox Oil: Uses ISO EP 320 (mineral oil) for tropical ambient temperatures. Specific recommendations for cold climates are provided (Chevron Meropa ISO EP 320 for North America, -18°C to 80°C). The gearbox oil capacity is engraved on the serial tag.
- Gearbox Oil Level Check and Drain: The manual details a procedure for draining and refilling gearbox oil, which involves removing the drive unit from the gimbal assembly, draining oil, and refilling to the correct level (hole between 60°-70° from horizontal).
- Greasing: The 4-way swing gimbal has 4 grease nipples that need regular lubrication to ensure free movement of the drive unit.
- Seal Replacement: Detailed steps for replacing the shaft seal are provided, including cleaning the area, applying multipurpose grease and threadlocker, and tapping the new seal into place.
- Pre-Operation Checks: Before each use, operators should check all nuts, bolts, and fasteners, hydraulic fittings for leaks, safety signs for legibility, and pins, linkages, and cutting edges for wear. Only manufacturer-recommended replacement parts should be used.
- Storage: When storing, hydraulic couplers should be sealed, hoses secured off the ground, the unit cleaned, and inspected for damage. Output shaft, collar, extension shaft, and connecting pins should be liberally coated with grease. Safety decals should be replaced if damaged. The unit should be stored in a dry, protected place.
- Warranty: The motor and gearbox have a 1-year warranty, subject to compliance with service intervals and manufacturer inspection. The warranty is voided by unauthorized modifications, disassembly, or failure to perform oil changes at specified times.
Need help?
General
To Next Page