Craftsman Excavator Operator cheat sheet

Hierarchy of controls, most to least effective: elimination, substitution, engineering controls, administrative controls, PPE. Excavator examples: remote-controlled demolition instead of cab operation; water spray or dust suppression instead of respirators alone.

Three-point contact rule applies to cab entry and exit: two hands and one foot, or two feet and one hand, in contact with the machine at all times; never carry tools while mounting.

Hazardous noise action level is typically 85 dB(A) as an 8-hour time-weighted average; hearing protection and audiometric testing are triggered at or above that level in most jurisdictions.

Whole-body vibration exposure from excavator seating is assessed per ISO 2631-1; reduced by correct seat suspension adjustment, smooth joystick control, and limiting continuous operating hours.

Diesel particulate matter is a known carcinogen; cab pressurization with HEPA filtration plus idling reduction are the primary engineering controls on older machines.

Spill response order: stop the source, contain with absorbent or bunding, protect drains and watercourses, report per site plan; never hose fuel or hydraulic fluid into drainage.

Refuelling rules: engine off, no smoking or naked flame within the refuelling zone, bonding/earthing where required, drip tray under the nozzle, spill kit within reach.

Excavator swing radius and counterweight tail swing define the exclusion zone; ground personnel must never stand inside the swing zone, and the zone is barricaded when the operator's visibility is restricted.

Power flow: engine → flywheel → hydraulic pumps (main pumps) → control valves → cylinders and motors → work equipment and travel. Pilot pump or pilot circuit supplies low-pressure oil to the joysticks.

Main hydraulic circuit types: open-centre (fixed displacement pumps, flow bypasses at neutral) versus closed-centre/load-sensing (variable displacement pumps match flow to demand, reducing heat and fuel use).

Undercarriage components: track chain, track shoes (grouser plates), rollers (upper and lower), idler, sprocket, track adjuster (grease cylinder). Track tension is set by greasing or bleeding the adjuster, never by the tensioner valve alone.

Boom, arm (stick), and bucket form the work equipment; bucket linkage geometry determines breakout force. Hydraulic quick couplers must be mechanically locked and verified before lifting.

Counterweight balances lift capacity; rated capacity decreases as load radius increases and as the load swings over the side rather than over the idler or sprocket.

Travel drives are either independent (each track driven by its own motor) or a single drive with a steering clutch; independent drives allow counter-rotation (spot turn) in place.

Slew (swing) system: swing motor, swing reduction gear, swing bearing, and swing brake; the swing parking brake is normally spring-applied and hydraulically released.

Engine ratings: gross versus net horsepower differ by fan and accessory loads; hydraulic pump flow (L/min) and relief valve setting determine cycle speed and maximum digging force.

Walk-around sequence: fluid levels and leaks under the machine, track tension and shoe condition, bucket teeth and cutting edge, hydraulic hoses for chafing and cracks, guards and handrails, lights and horn, fire extinguisher present and charged.

Fluid checks: engine oil on level ground with engine stopped; hydraulic oil with the machine level and the attachment lowered; coolant only when cold. Never open a hot pressurized radiator cap.

Greasing points on a typical excavator include boom foot, boom cylinder ends, arm cylinder ends, bucket linkage, and swing bearing; over-greasing a sealed pin can blow the seal.

Track tension is correct when the specified sag (commonly 10–30 mm for the track span between idler and first roller) is measured on level ground; too tight accelerates pin and bushing wear, too loose causes derailment.

Filters: engine oil, fuel (with water separator drained daily), hydraulic return and pilot filters, and air cleaner (clean or replace per restriction indicator, never wash a paper element in solvent).

Battery and electrical: check electrolyte level on serviceable batteries, terminal tightness and corrosion, alternator belt tension; disconnect negative first when isolating.

Warm-up: idle the engine at low speed for several minutes and cycle the hydraulics slowly before full load, especially in cold weather; cold hydraulic oil is high viscosity and can cavitate the pump.

Record keeping: hour-meter readings, defect reports, and service intervals are logged; a defect affecting safe operation requires the machine be tagged out until repaired.

Operator responsibility: operate only machines they are trained and authorized for, maintain a daily inspection record, report defects, and stop work when conditions become unsafe.

Standard excavator hand signals (common international set): raise boom = arm extended upward with palm up and move hand upward; lower boom = palm down moving downward; swing = point in the direction of swing; stop = hand raised palm forward.

Emergency stop signal is any signal from anyone on site; the operator must stop immediately when a stop signal is given, regardless of who gives it.

When hand signals are used, one designated signaler communicates with the operator; the operator stops if the signaler is out of sight or the signal is unclear.

Two-way radio protocol: identify machine, state intention, wait for acknowledgement; keep a dedicated channel for lifting and confined-space operations.

Blind spots: excavators have significant blind areas around the counterweight and right side; use mirrors, cameras, or a spotter when reversing or slewing near personnel.

Pedestrians and ground workers must make eye contact with the operator before entering the working area; high-visibility clothing and site traffic plans are mandatory.

Operator fitness: fatigue, medication, alcohol, and illness impair judgment; report unfit-for-duty status and never operate under the influence.

Start-up: seat belt fastened, controls in neutral, safety lock lever raised (engaged), horn sounded before moving; never start the engine with the hydraulic lock released.

Travel posture: for stability and visibility, travel with the undercarriage in the correct orientation - sprocket/idler forward per manufacturer and the boom over the idler end when climbing. Keep the bucket low, about 200–400 mm above ground.

Counter-rotation (spot turn) is performed with independent track drives by moving one track forward and the other in reverse; avoid it on steep or slippery ground.

Slew control: decelerate smoothly before stopping the swing; abrupt stops swing the load and stress the swing bearing and can tip the machine.

Digging cycle: position the bucket, curl while crowding the arm, then lift with the boom; use the arm cylinder for the main digging force and the boom for lifting, not vice versa.

Do not use the bucket as a hammer or drop it to break ground; use a breaker attachment. Do not use the boom or arm to push or pull loads sideways.

Travel on slopes: keep the bucket low and facing downhill, travel straight up or down (never across the face), and reduce speed; maximum grade limits are in the operator manual.

Parking: park on level ground, lower the attachment to the ground, set the safety lock, apply the travel lock, stop the engine, and remove the key.

Trenching rules: spoil and materials kept at least 1 m (or the jurisdiction's specified distance) from the trench edge; never stockpile spoil over the trench line where it adds surcharge load.

Trench protection is required at depths defined by regulation (commonly 1.2–1.5 m in many jurisdictions); use sloping, benching, shoring, or a trench box, and inspect daily and after rain.

Underground service locating: obtain utility drawings, use cable/pipe locators and trial pits (potholing) before digging; treat any unmarked line as live.

Bucket choice: toothed bucket for compacted or rocky soil, smooth (ditching) bucket for finishing and grading, and a grading bucket with tilt for batter work.

Excavation sequence: strip topsoil separately, excavate in lifts, maintain a level bench for the machine, and keep a safe egress route from the trench at all times.

Rated lift capacity: read the load chart at the actual radius and height; capacity drops sharply as radius increases. Never exceed 75% of tipping capacity without a lift plan and, where required, a lift engineer.

Material handling with a sling: use certified slings and shackles, attach to the designated lifting point, keep the load low, avoid side loading, and never lift people with the bucket or a slung load.

Backfilling: compact in layers, do not drop large rocks onto pipes, and keep the bucket clear of the trench edge to avoid collapse under the machine's weight.

Slope work: check the stability of the bench and the slope face before positioning; the machine must sit level, with outriggers or a stable bench, and never on an undercut edge.

Side-slope and cross-slope limits: follow the manufacturer's gradeability; on slopes, keep the boom on the uphill side and the bucket close to the ground for a quick brace.

Confined spaces: an excavator cab is not a confined space, but excavations, pits, and tanks are; entry requires atmospheric testing (O2, flammable gas, H2S/CO as applicable), a permit, an attendant, and rescue arrangements.

Excavation near water or in wet ground: use a wide bench, dewater, and monitor for boiling or seepage that signals instability; never work under an overhanging bank.

Hazardous atmospheres: diesel exhaust and CO accumulate in enclosed pits; forced ventilation is required and engines should not idle in the pit.

Working near power lines: maintain the jurisdiction's minimum approach distance, use a spotter, and have the line de-energized and earthed where possible; voltage determines the distance.

Demolition and unstable structures: work from outside the collapse zone, use a remote or long-reach method, and never pull a wall toward the machine.

Night and low-light work: use machine and site lighting, high-visibility markings, and reduce speed; glare and shadows hide edges and personnel.

Hydraulic oil overheating: check oil level, radiator and oil cooler fins for debris, fan belt, relief valve setting, and whether the machine is being operated with a relief held open (e.g. dead-heading a cylinder).

Slow or weak hydraulics: suspect low oil level, clogged suction strainer, worn pump, faulty relief valve, or leaking cylinder seals; test with a pressure gauge at the test port.

Track derailment: relieve track tension, use the bucket to lift the machine and realign, then re-tension; investigate misalignment, worn sprocket, or loose tension first.

Engine will not start: check fuel shut-off, battery and terminals, fuel filter and water separator, air in the fuel line, and safety interlocks (seat, lock lever).

Black smoke under load indicates over-fuelling or restricted air intake; white smoke at start-up can be normal cold-weather behaviour, persistent white smoke suggests injector or coolant issues.

Fire: shut off the engine and fuel, use the on-board extinguisher on the source, evacuate upwind, and call emergency services; never open a hot hydraulic fitting.

Machine tipping or sinking: lower the attachment, stop travel, call for recovery; never attempt to climb out of a tipped cab without assessing the risk of further rollover.

Emergency shutdown: know the location of the battery isolator, fuel shut-off, and fire suppression activation; report every incident and near miss for investigation.