CSCS Tractor/Dozer flashcards
CSCS Tractor/Dozer · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Bulking factor
- The ratio of excavated loose volume to in-situ volume. Many soils bulk by about 1.2 to 1.4, so haul and stockpile volumes must allow for the increase.
- Plastic limit
- The moisture content at which a cohesive soil changes from plastic to semi-solid behaviour. Above it, soils become unworkable and unstable under plant.
- Track tension check
- Measured as the sag over a set length of track against the manufacturer's specification. Too loose risks derailment; too tight accelerates undercarriage wear.
- ROPS and FOPS
- Roll-over and falling-object protective structures. They are certified and must not be modified or welded without assessment by a competent person.
- Seat belt rule
- The seat belt is worn whenever the machine is moving or working. ROPS only protects the operator when they are restrained inside the structure.
- Gradient travel rule
- A dozer travels up and down a slope, not across it, keeping the blade low. Turns are made on level ground at the top or bottom.
- Ground pressure formula
- Machine weight divided by total track contact area. It is compared with the ground's bearing capacity before the machine enters soft ground.
- Drawbar pull limit
- The usable pushing force is limited by track grip. Track slip shows the traction limit has been reached and pushing harder risks loss of control.
- Exclusion zone
- The marked area around a working machine that no person may enter. It covers the machine's swing radius, blade width and a margin for unexpected movement.
- Banksman role
- A trained signaller who directs machine movement when the operator's view is restricted. Agreed signals are confirmed before work and when the banksman changes.
- Angle blade use
- A blade offset to cast material to one side. It is used for ditching and side casting and reduces the need to turn the machine.
- Ripper selection
- A single shank penetrates tough, massive material; multiple shanks cover more width in easier ground. Depth and angle are set to avoid stalling.
- Slot dozing
- Parallel cuts that leave walls of material at the blade sides. The walls reduce spillage and improve load retention over longer pushes.
- Push loading
- A dozer pushes a scraper during its loading run. Contact is made squarely on the push block and pushing stops when the scraper is loaded.
- Lockout tagout
- Isolation of a machine before maintenance, with a lock and tag held by the person doing the work. It prevents unexpected start-up or movement.
- Fuel bund capacity
- Fuel storage bunds hold at least 110% of the largest container. They are sited away from drains and watercourses, with a spill kit available.
- Dust suppression
- Water bowsers, reduced drop heights, sheeting loads and speed limits on haul roads. A visible dust plume shows the controls are failing.
- Spill response steps
- Stop the source, contain with absorbent or bunding, prevent entry to drains and watercourses, then report and record the spill.
- Spill kit contents
- Absorbent granules or pads, booms, drain seals, gloves, bags and a means of disposal. The kit is checked and restocked after use.
- Silica dust hazard
- Dust from silica-containing materials is a health hazard. Water suppression and respiratory protection are used where dust cannot be eliminated.
- Compaction plant match
- Smooth drum rollers suit granular soils, sheepsfoot rollers suit cohesive soils, and heavy pneumatic tyred rollers suit both.
- Moisture condition value
- A test of a soil's compactability at its current moisture content. It is used to decide whether cohesive fill can reach the specified density.
- Blade pitch
- The angle of the blade to the ground. A more aggressive pitch increases penetration in hard ground and increases load in loose material.
- Quick hitch check
- After an attachment change, confirm the locking pins are fully seated and retained. A missing retainer lets a pin walk out under load.
- Overhead line clearance
- A safe distance from power lines set by the network operator. Where it cannot be met, the line is isolated or goal posts and barriers are installed.
- Near miss reporting
- Unplanned events that did not cause harm are reported and investigated like incidents. Findings feed back into exclusion zones and the method.
- Defect categories
- Safety-critical defects stop the machine immediately. Other defects are scheduled and recorded with a target repair date and are verified after repair.
- Undercarriage wear limits
- Track pitch, roller wear and sprocket teeth are measured and compared with the manual's limits. Wear beyond the limit causes derailment and damage.
- Low ground pressure tracks
- Wider tracks that reduce ground pressure and sinkage on soft ground. They increase undercarriage wear and reduce travel speed.
- Back-blading
- Using the back of the blade while reversing to leave a clean, level surface after spreading fill with the front of the blade.
- Silt fencing
- A barrier that intercepts silt-laden runoff from stockpiles and disturbed ground before it reaches drains or watercourses.
- Drain sealing on spill
- A spill entering a drain is a reportable incident. The drain is sealed, the material recovered, and the event reported before any flushing.