Major Work Activity J - Services, diagnoses and repairs hydraulic systems
Table of Contents
Task J-39 Services, diagnoses and repairs hydraulic systems
Task Descriptor
Hydraulic systems pump confined fluid to transfer energy smoothly from one component to another. Advantages of using hydraulics include smooth and quiet operation, and adjustability of speed and force to prevent damage, which allows for a versatile and adaptable system.
Truck and transport mechanics must service, diagnose and repair hydraulic systems to ensure proper function and reduce down time.
J-39.01 - Services hydraulic systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| J-39.01.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| J-39.01.02P | clean components | components are cleaned according to manufacturers’ service information |
| J-39.01.03P | perform sensory inspections | sensory inspections are performed to identify worn, damaged and defective components |
| J-39.01.04P | release stored energy | stored energy is released in a controlled manner without releasing fluid from system |
| J-39.01.05P | support raised components mechanically | raised components are supported mechanically to prevent accidental dropping of component or load |
| J-39.01.06P | remove and replace consumables | consumables are removed and replaced according to manufacturers’ service information |
| J-39.01.07P | recycle and dispose of consumables | consumables are recycled and disposed of according to jurisdictional regulations |
| J-39.01.08P | record service information and inspection findings | service information and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components (to be cleaned) include: inlet screens, reservoirs
- sensory inspections include: listening for noises, looking for leaks, feeling for hot spots, smelling for burnt oil
- components include: gaskets, seals, hoses, fittings, pumps, actuators, relief valves, control valves, reservoirs, PTO, drop boxes (transfer case), ECMs, solenoids, sensors, harnesses
- consumables include: filters, oil
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| J-39.01.01L | demonstrate knowledge of hydraulic systems, their components, consumables, characteristics, applications and operation | identify hydraulic systems and their components and consumables, and describe their characteristics and applications |
| describe operating principles of hydraulic systems and their components | ||
| identify pressure limits of hoses, tubing and fittings | ||
| identify types of hydraulically powered applications | ||
| J-39.01.02L | demonstrate knowledge of procedures to service hydraulic systems and components | identify tools and equipment used to service hydraulic systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to hydraulic systems and their components | ||
| describe procedures to release stored energy | ||
| describe procedures to inspect hydraulic systems and their components | ||
| describe procedures to clean hydraulic systems and their components | ||
| describe procedures to remove, replace, recycle and dispose of hydraulic consumables | ||
| identify oil sampling procedures | ||
| J-39.01.03L | demonstrate knowledge of training and certification requirements pertaining to hydraulic systems and hydraulically powered applications | identify training and certification requirements pertaining to hydraulic systems and hydraulically powered applications |
| J-39.01.04L | demonstrate knowledge of regulatory requirements pertaining to hydraulic systems and hydraulically powered applications | identify codes, standards and regulations pertaining to hydraulic systems and hydraulically powered applications |
Range of Variables
- components include: gaskets, seals, hoses, fittings, pumps, actuators, relief valves, control valves, reservoirs, PTO, drop boxes (transfer case), ECMs, solenoids, sensors, harnesses
- consumables include: filters, oil
- hydraulically powered applications include: cement mixers, dump boxes, compactors, snow removal equipment, lift gates, aerial lifts, mobile cranes
- hazards include: stored high pressure, skin and eye irritation, flammability, high heat
J-39.02 - Diagnoses hydraulic systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| J-39.02.01P | identify symptoms of problems | symptoms of problems are identified by consulting with customer or operator |
| J-39.02.02P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| J-39.02.03P | release stored energy | stored energy is released in a controlled manner without releasing fluid from system |
| J-39.02.04P | support raised components mechanically | raised components are supported mechanically to prevent accidental dropping of component or load |
| J-39.02.05P | perform sensory inspections | sensory inspections are performed to confirm complaint and establish preliminary diagnosis |
| J-39.02.06P | perform diagnostic procedure | diagnostic procedure is performed by following manufacturers’ service information to determine failure |
| J-39.02.07P | perform tests | tests are performed to assess components for wear, damage or defects |
| J-39.02.08P | compare test results to manufacturers’ service information or expected values to verify diagnosis | test results are compared to manufacturers’ service information or expected values to verify diagnosis |
| J-39.02.09P | perform failure analysis | failure analysis is performed to determine root cause of failure |
| J-39.02.10P | record test results and inspection findings | test results and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
| J-39.02.11P | interpret diagnostic results | diagnostic results are interpreted to determine next steps |
Range of Variables
- symptoms of problems include:fail to raise or lower, slow operation, leaking, intermittent or erratic operation, noisy operation
- tools and equipment include: pressure gauges, flow meters, temperature gauges, restriction gauges
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- sensory inspections include: listening for noises, looking for leaks, feeling for hot spots, smelling for burnt oil
- tests include: pressure, flow, restriction, cycle time
- components include: gaskets, seals, hoses, fittings, pumps, actuators, relief valves, control valves, reservoir, PTO, drop boxes (transfer case), ECMs, solenoids, sensors, harnesses
- next steps include: repairs, component replacement or adjustment, further diagnosis
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| J-39.02.01L | demonstrate knowledge of hydraulic systems, their components, consumables, characteristics, applications and operation | identify hydraulic systems and their components and consumables, and describe their characteristics and applications |
| describe operating principles of hydraulic systems and their components | ||
| identify pressure limits of hoses, tubing and fittings | ||
| identify types of hydraulically powered applications | ||
| J-39.02.02L | demonstrate knowledge of procedures to diagnose hydraulic systems and their components | identify tools and equipment used to diagnose hydraulic systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to hydraulic systems and their components | ||
| describe procedures to release stored energy | ||
| describe procedures to inspect hydraulic systems and their components | ||
| describe procedures to test hydraulic systems and their components | ||
| describe procedures to diagnose hydraulic systems and their components | ||
| describe common causes and symptoms of problems | ||
| identify oil sampling procedures | ||
| J-39.02.03L | demonstrate knowledge of training and certification requirements pertaining to hydraulic systems and hydraulically powered applications | identify training and certification requirements pertaining to hydraulic systems and hydraulically powered applications |
| J-39.02.04L | demonstrate knowledge of regulatory requirements pertaining to hydraulic systems and hydraulically powered applications | identify codes, standards and regulations pertaining to hydraulic systems and hydraulically powered applications |
Range of Variables
- components include: gaskets, seals, hoses, fittings, pumps, actuators, relief valves, control valves, reservoir, PTO, drop boxes (transfer case), ECMs, solenoids, sensors, harnesses
- consumables include: filters, oil
- hydraulically powered applications include: cement mixers, dump boxes, compactors, snow removal equipment, lift gates, aerial lifts, mobile cranes
- tools and equipment include: pressure gauges, flow meters, temperature gauges, restriction gauges
- hazards include: stored high pressure, skin and eye irritation, flammability, high heat
- symptoms of problems include:fail to raise or lower, slow operation, leaking, intermittent or erratic operation, noisy operation
J-39.03 - Repairs hydraulic systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| J-39.03.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| J-39.03.02P | release stored energy | stored energy is released in a controlled manner without releasing fluid from system |
| J-39.03.03P | support raised components mechanically | raised components are supported mechanically to prevent accidental dropping of component or load |
| J-39.03.04P | remove and replace worn, damaged and faulty components | worn, damaged and faulty components are removed and replaced according to manufacturers’ service information |
| J-39.03.05P | rebuild components | components are rebuilt according to manufacturers’ service information |
| J-39.03.06P | repair components | components are repaired by replacing parts causing failure according to manufacturers’ service information |
| J-39.03.07P | perform adjustments | adjustments are performed to ensure proper operation of components and equipment |
| J-39.03.08P | verify repairs | repairs are verified using methods according to manufacturers’ service information |
| J-39.03.09P | document repairs and verifications performed | repairs and verifications performed are documented for warranty, liability, future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components include: gaskets, seals, hoses, fittings, oil, pumps, actuators, relief valves, control valves, reservoirs, PTO, drop boxes (transfer case), ECMs, solenoids, sensors, harnesses
- adjustments include: setting pressure and flow
- methods include: operational tests, verifying pressures and flow
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| J-39.03.01L | demonstrate knowledge of hydraulic systems, their components, consumables, characteristics, applications and operation | identify hydraulic systems and their components and consumables, and describe their characteristics and applications |
| describe operating principles of hydraulic systems and their components | ||
| interpret information pertaining to hydraulic systems and their components found in manufacturers’ service information | ||
| identify pressure limits of hoses, tubing and fittings | ||
| identify types of hydraulically powered applications | ||
| J-39.03.02L | demonstrate knowledge of procedures to repair hydraulic systems and their components | identify tools and equipment used to repair hydraulic systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to hydraulic systems and their components | ||
| describe procedures to release stored energy | ||
| describe procedures to remove, replace, adjust and repair hydraulic systems and their components | ||
| J-39.03.03L | demonstrate knowledge of training and certification requirements pertaining to hydraulic systems and hydraulically powered applications | identify training and certification requirements pertaining to hydraulic systems and hydraulically powered applications |
| J-39.03.04L | demonstrate knowledge of regulatory requirements pertaining to hydraulic systems and hydraulically powered applications | identify codes, standards and regulations pertaining to hydraulic systems and hydraulically powered applications |
Range of Variables
- components include: gaskets, seals, hoses, fittings, oil, pumps, actuators, relief valves, control valves, reservoirs, PTO, drop boxes (transfer case), ECMs, solenoids, sensors, harnesses
- consumables include: filters, oil
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- hydraulically powered applications include: cement mixers, dump boxes, compactors, snow removal equipment, lift gates, aerial lifts, mobile cranes
- hazards include: stored high pressure, skin and eye irritation, flammability, high heat