Major Work Activity D - Diagnoses and repairs hydraulic, hydrostatic and pneumatic systems
Table of contents
- Task D-10 Diagnoses hydraulic, hydrostatic and pneumatic systems
- Task D-11 Repairs hydraulic, hydrostatic and pneumatic systems
Task D-10 Diagnoses hydraulic, hydrostatic and pneumatic systems
Task descriptor
Agricultural equipment technicians must be able to understand the theory of hydraulics, hydrostatic and pneumatic systems. They need to differentiate whether the problem is mechanical, electrical or hydraulic when doing diagnostics and use the proper testing equipment to help identify the problem.
D-10.01 Diagnoses hydraulic and hydrostatic systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NV | yes | NV | NV | NV | yes | yes | yes | yes | ND | NV | NV | ND |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| D-10.01.01P | identify symptoms of problem | symptoms of problem are identified by consulting with customer or operator |
| D-10.01.02P | check if power is being supplied to drive systems | power is checked to see if it is being supplied to drive systems |
| D-10.01.03P | perform sensory inspections to identify faults | sensory inspections are performed to identify faults |
| D-10.01.04P | check and retrieve diagnostic service codes | service codes are referred to manuals for instructions on diagnosis |
| D-10.01.05P | determine system function and component location | system function and component location are determined by interpreting hydraulic system schematics |
| D-10.01.06P | select and use tools and equipment | tools and equipment are selected and used according to application |
| D-10.01.07P | remove components to access diagnostic area | components are removed to access diagnostic area |
| D-10.01.08P | perform tests at operating temperature and at rated revolutions per minute (RPM) | tests are performed at operating temperature and at rated RPM according to manufacturers’ specifications |
| D-10.01.09P | interpret test results and compare to manufacturers’ specifications | test results are interpreted and compared to manufacturers’ specifications |
| D-10.01.10P | determine required actions | required actions are determined |
Range of variables
- symptoms of problem include: heat, low power, creeping in neutral, abnormal noises, service codes
- faults include: leaks, abnormal noises, heat, failed hoses, low power, low pressure, creeping in neutral
- tools and equipment include: temperature measuring devices, flow meters, pressure gauges, OEM specialty tools
- components (removed for access) include: panels, shields, hoods
- tests include: pressure, flow, case drain, temperature
- required actions include: repairs, replacement or adjustment of pumps or valves, further diagnosis
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| D-10.01.01L | demonstrate knowledge of hydraulic and hydrostatic systems, their components, characteristics, applications and operation | identify hydraulic systems and their components, and describe their characteristics, applications and operation |
| identify hydrostatic systems and their components, and describe their characteristics, applications and operation | ||
| describe mechanically-controlled and electronically-controlled hydraulic and hydrostatic systems | ||
| identify various types of fluids used in hydraulic and hydrostatic systems | ||
| D-10.01.02L | demonstrate knowledge of diagnostic manuals | describe diagnostic information retrieval and its procedures for use |
| D-10.01.03L | demonstrate knowledge of diagnosing hydraulic and hydrostatic systems and their components | identify tools and equipment used to diagnose hydraulic and hydrostatic systems and their components, and describe their applications and procedures for use |
| describe procedures to diagnose hydraulic and hydrostatic systems and their components | ||
| identify hazards and describe safe work practices while diagnosing hydraulic and hydrostatic systems and their components | ||
| identify inspections and tests performed to diagnose hydraulic and hydrostatic systems and their components | ||
| identify possible faults found while performing inspections and tests | ||
| D-10.01.04L | demonstrate knowledge of sensor functions | identify sensor functions and describe their applications |
| D-10.01.05L | demonstrate knowledge of safety bypass systems | identify safety bypass systems and describe their applications |
Range of variables
- hydraulic systems include: open-centre, closed-centre, blended
- hydrostatic systems include: open loop, closed loop, blended, fixed displacement, variable displacement
- components (hydraulic systems) include: pumps, rock shafts/three-point hitch, cylinders, motors, actuators, fluids, controllers, wiring harnesses, valves, sensors, gauges, reservoirs, oil coolers, lines and hoses, fittings
- components (hydrostatic systems) include: motors, pumps, reservoirs, valves, controllers, oil coolers, lines and hoses, fittings, wiring harnesses, sensors, gauges
- tools and equipment include: temperature measuring devices, flow meters, pressure gauges, OEM specialty tools
- tests include: pressure, flow, case drain, temperature
- faults include: leaks, abnormal noises, heat, failed hoses, low power, low pressure, creeping in neutral
- safety bypass systems include: cooler bypass valves, oil filter bypass valves, relief valves
D-10.02 Diagnoses pneumatic systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NV | yes | NV | NV | NV | yes | yes | yes | yes | ND | NV | NV | ND |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| D-10.02.01P | identify symptoms of problem | symptoms of problem are identified by consulting with customer or operator |
| D-10.02.02P | check if power is being supplied to drive systems | power is checked to see if it is being supplied to drive systems |
| D-10.02.03P | perform sensory inspections to identify faults | sensory inspections are performed to identify faults |
| D-10.02.04P | check and retrieve diagnostic service codes | service codes are referred to manuals for instructions on diagnosis |
| D-10.02.05P | determine system function and component location | system function and component location is determined by interpreting pneumatic system schematics |
| D-10.02.06P | select and use tools and equipment | tools and equipment are selected and used according to application |
| D-10.02.07P | remove components to access diagnostic area | components are removed to access diagnostic area |
| D-10.02.08P | perform tests | tests are performed |
| D-10.02.09P | interpret test results and compare to manufacturers’ specifications | test results are interpreted and compared to manufacturers’ specifications |
| D-10.02.10P | determine required actions | required actions are determined |
Range of variables
- symptoms of problem include: poor braking, service codes, abnormal noises, loss of pressure, soft suspension
- faults include: leaks, abnormal noises, heat, broken hoses, low power, low pressure
- tools and equipment include: pressure gauges, hand tools, OEM specialty tools, power tools
- components (removed for access) include: panels, shields, hoods
- tests include: pressure, time, flow
- required actions include: repairs, replacement or adjustment of compressors, valves and lines, further diagnosis
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| D-10.02.01L | demonstrate knowledge of pneumatic systems, their components, characteristics, applications and operation | identify types of pneumatic systems and their components, and describe their characteristics, applications and operation |
| D-10.02.02L | demonstrate knowledge of diagnosing pneumatic systems and their components | identify tools and equipment used to diagnose pneumatic systems and their components, and describe their applications and procedures for use |
| describe procedures to diagnose pneumatic systems and their components | ||
| identify hazards and describe safe work practices while diagnosing pneumatic systems and their components | ||
| identify inspections and tests performed to diagnose pneumatic systems and their components | ||
| identify possible faults found while performing inspections and tests | ||
| D-10.02.03L | demonstrate knowledge of sensor functions | identify sensor functions and describe their applications |
| D-10.02.04L | demonstrate knowledge of safety bypass systems | identify safety bypass systems and describe their applications |
Range of variables
- components (pneumatic) include: hoses, fittings, compressors, valves, lines
- tools and equipment include: pressure gauges, hand tools, OEM specialty tools, power tools
- tests include: pressure, time, flow
- faults include: leaks, abnormal noises, heat, broken hoses, low power, low pressure
Task D-11 Repairs hydraulic, hydrostatic and pneumatic systems
Task descriptor
Agricultural equipment technicians must use the appropriate tools, measuring devices and procedures to return hydraulic, hydrostatic and pneumatic systems to manufacturers’ specifications.
D-11.01 Repairs hydraulic and hydrostatic systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NV | yes | NV | NV | NV | yes | yes | yes | yes | ND | NV | NV | ND |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| D-11.01.01P | select and use tools and equipment | tools and equipment are selected and used according to application |
| D-11.01.02P | remove components to access repair area | components are removed to access repair area |
| D-11.01.03P | repair or replace hydraulic components | hydraulic components are repaired or replaced |
| D-11.01.04P | clean valves, motors, hoses and components after catastrophic failure | valves, motors, hoses and components are cleaned to prevent further damage or repeat failure |
| D-11.01.05P | adjust pumps and valves for pressure and flow | valves are adjusted for pressure and flow according to manufacturers’ specifications |
| D-11.01.06P | reassemble unit after repair | unit is reassembled after repair according to OEM assembly procedures |
| D-11.01.07P | verify system operations | system operations are verified to OEM standards |
Range of variables
- tools and equipment include: hand tools, OEM specialty tools, oil reclamation, power tools
- components (removed for access) include: panels, hoods, shields
- components (hydraulic systems) include: pumps, rock shafts/three-point hitch, cylinders, motors, actuators, fluids, controllers, wiring harnesses, valves, fittings, oil coolers, sensors
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| D-11.01.01L | demonstrate knowledge of hydraulic and hydrostatic systems, their components, characteristics, applications and operation | identify hydraulic systems and their components, and describe their characteristics, applications and operation |
| identify hydrostatic systems and their components, and describe their characteristics, applications and operation | ||
| describe mechanically-controlled and electronically-controlled hydraulic and hydrostatic systems | ||
| D-11.01.02L | demonstrate knowledge of repairing hydraulic and hydrostatic systems and their components | identify tools and equipment used to repair hydraulic and hydrostatic systems and their components, and describe their applications and procedures for use |
| describe procedures to disassemble and reassemble hydraulic and hydrostatic systems | ||
| describe procedures to repair and replace hydraulic and hydrostatic system components | ||
| identify hazards and safe work practices while performing repairs | ||
| describe verification procedures for system operations |
Range of variables
- hydraulic systems include: open centre, closed centre, blended
- hydrostatic systems include: open loop, closed loop, blended, fixed displacement, variable displacement
- components (hydraulic systems) include: pumps, rock shafts/three-point hitch, cylinders, motors, actuators, fluids, controllers, wiring harnesses, valves, fittings, oil coolers, sensors
- components (hydrostatic systems) include: motors, pumps, reservoirs, valves, controllers, oil coolers, lines and hoses, fittings, wiring harnesses, sensors, gauges
- tools and equipment include: hand tools, OEM specialty tools, oil reclamation, power tools
D-11.02 Repairs pneumatic systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NV | yes | NV | NV | NV | yes | yes | yes | yes | ND | NV | NV | ND |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| D-11.02.01P | select and use tools and equipment | tools and equipment are selected and used according to application |
| D-11.02.02P | remove components to access repair area | components are removed to access repair area |
| D-11.02.03P | repair or replace pneumatic components | pneumatic components are repaired or replaced |
| D-11.02.04P | adjust valves for pressure and operating height for suspension | valves are adjusted for pressure and operating height for suspension according to manufacturers’ specifications |
| D-11.02.05P | reassemble unit after repair | unit is reassembled after repair according to OEM assembly procedures |
| D-11.02.06P | verify system operations | system operations are verified to OEM standards |
Range of variables
- tools and equipment include: hand tools, OEM specialty tools, power tools
- components (removed for access) include: panels, hoods, shields
- components (pneumatic systems) include: hoses, fittings, compressors, valves, lines
- system operations include: air brakes, air suspension, debris blow-off systems
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| D-11.02.01L | demonstrate knowledge of pneumatic systems, their components, characteristics, applications and operation | identify types of pneumatic systems and their components, and describe their characteristics, applications and operation |
| D-11.02.02L | demonstrate knowledge of repairing pneumatic systems and their components | identify tools and equipment used to repair pneumatic systems and their components, and describe their applications and procedures for use |
| describe procedures to disassemble and reassemble pneumatic systems | ||
| describe procedures to repair and replace pneumatic system components | ||
| identify hazards and safe work practices while performing repairs | ||
| describe verification procedures for system operations |
Range of variables
- components (pneumatic systems) include: hoses, fittings, compressors, valves, lines
- tools and equipment include: hand tools, OEM specialty tools, power tools
- system operations include: air brakes, air suspension, debris blow-off systems