JASKO - Maintenance Procedures

At JASKO Enterprises, Inc., our unwavering commitment to safety is reflected in our meticulous maintenance procedures and policies, ensuring the highest standards of vehicle safety on the road.

Creating inspection reports is a crucial element of maintaining safety standards at JASKO Enterprises, Inc. In our commitment to vehicle safety, we, as the carrier, play a pivotal role in ensuring that the vehicles we operate are in optimal condition. To achieve this, we adhere to safety inspection procedures and diligently report any detected deficiencies to our maintenance team for prompt repairs.

For a seamless implementation of safety measures, JASKO Enterprises, Inc. has established the following checklist:

Carrier Checklist:

  • Develop FMCSA-compliant inspection and reporting procedures for our drivers.
  • Provide comprehensive training to our drivers to inspect safety-critical components and assess their condition.
  • Equip our drivers with inspection aids and the necessary report forms.
  • Ensure that our maintenance personnel promptly address and resolve driver-reported deficiencies.
  • Implement our company-established standards for placing vehicles out of service.
  • Encourage our drivers to refrain from driving if they identify a deficiency that warrants placing the vehicle out of service.

Driver Checklist:

  • As a driver, thoroughly inspect the vehicle and report its condition accurately.
  • Adhere to federal and state laws by refraining from driving a vehicle deemed unsafe.
  • During a trip, vigilantly monitor the condition of vehicle components that may impact safety.
  • If any issues arise during the journey, stop in a safe location, inspect the vehicle, and only continue if it is deemed safe to do so.

At JASKO Enterprises, Inc., we take pride in prioritizing safety, and these procedures are integral to maintaining the well-being of our team and the roadworthiness of our vehicles.

Ensuring optimal brake performance is critical to prevent catastrophic failures, such as sudden air loss, which may lead to losing control and the inability to recover. Progressive brake deterioration, without corresponding adjustment, may seem harmless during normal driving but can result in accidents during emergency braking applications.

At JASKO Enterprises, Inc., we prioritize brake safety, and to uphold this commitment, we have established the following checklist:

Carrier Checklist:

  • Practice preventive maintenance procedures to detect and repair worn or defective brake system components.
  • Establish out-of-service standards for monitoring brake system components most likely to deteriorate progressively—such as air leaks, brake shoe wear, drum wear, and bearing seal leakage.
  • Train our drivers to detect deteriorated conditions during their inspections.
  • Train our mechanics and maintenance supervisors on how to maintain braking systems.
  • Have an inspection lane dedicated to checking brake adjustment.

Driver Checklist:

  • As a driver, ensure that your brakes are properly adjusted.
  • Test your brakes before each trip to verify their functionality.
  • Regularly check low air warning devices for proper functioning.
  • Learn how to determine if the air system is operating satisfactorily.
  • During a trip, stop and check brake adjustment, especially before entering severe downgrades.

At JASKO Enterprises, Inc., we take proactive measures to maintain brake performance, emphasizing the importance of both carrier and driver responsibilities in ensuring road safety.

At JASKO Enterprises, Inc., we prioritize safety, and our commitment is evident in our comprehensive tire maintenance policies and procedures. As the owner of this policy, we emphasize:

Carrier Checklist:

  • Ensure drivers and maintenance personnel follow tire manufacturers’ specifications for inflation and loading.
  • Make tire inflation guidelines readily available to our drivers.
  • Train and equip drivers to check tire inflation, emphasizing the consequences of improper inflation, especially for recapped tires.
  • Adhere to company standards that align with the FMCSA's minimum tread depth requirements.
  • Establish standards for tire replacement and provide training to drivers and maintenance staff for recognizing replacement needs during inspections.

Maintenance Checklist:

  • Regularly check tires to ensure they meet the minimum DOT tread depth requirement (4/32” for steer tires and 2/32” for all other tires).
  • Avoid mounting mismatched sizes or pairing tires in duals with significantly different wear.
  • Avoid mixing tire styles on the same axle.
  • Follow company standards for identifying out-of-service conditions.

Driver Checklist:

  • Monitor tire inflation during extended trips.
  • Operate tires only with inflation pressures specified by the manufacturer.
  • Regularly check tires during vehicle inspections to ensure their condition aligns with company-established criteria.
  • Monitor tires for road damage such as tread or sidewall separation, cuts or gouges, flat spots or uneven wear, leaks, and flat tires at duals.

At JASKO Enterprises, Inc., we take ownership of these policies and procedures to uphold the highest standards of tire safety, preventing catastrophic failures and maintaining control on the road.

At JASKO Enterprises, Inc., we prioritize wheel safety to prevent assembly collapse and maintain control:

Carrier Checklist:

  • We train maintenance personnel to identify worn or deteriorated wheel and rim components and take them out of service.
  • We establish company standards for identifying out-of-service wheel conditions requiring replacement.
  • We ensure our company standard aligns with the minimum periodic inspection standards specified by the FMCSA.
  • We train drivers to detect deteriorated component conditions during their inspections.

Maintenance Checklist:

  • We use established company or industry guidelines to determine whether components should be returned to service.
  • We attempt to determine the cause of damage or deterioration to identify improper use or maintenance procedures that should be corrected.

Driver Checklist:

  • Look for cracks in wheels and rims during inspections.
  • Watch for rust around wheel nuts, and check for tightness, especially after a recent tire change.
  • Identify and replace any missing wheel components.

At JASKO Enterprises, Inc., we take ownership of these checklists, emphasizing the importance of preventive measures and driver awareness for wheel retention and deterioration.

At JASKO Enterprises, Inc., we prioritize trailer coupling safety to prevent trailer separation:

Carrier Checklist:

  • Equip towing vehicles and trailers with properly rated ball hitches, pintle hooks, fifth wheels, etc.
  • Ensure appropriate safety devices, such as chains and breakaway brakes, are available.
  • Maintain safety devices and coupling equipment properly on the power unit and trailer.
  • Train drivers on the proper use of coupling equipment.

Driver Checklist:

  • Check coupling components on both trailer and truck for good condition.
  • Adjust coupler if necessary.
  • Ensure electric and air lines are properly connected.

At JASKO Enterprises, Inc., we take ownership of these checklists, emphasizing the importance of proper equipment and training to prevent trailer separation.

Enhancing vehicle lighting and visibility is crucial to reduce risks and ensure the safety of our trucks and tractor-trailer combinations at JASKO Enterprises, Inc.:

Carrier Checklist:

  • Install and maintain proper lighting devices and reflectors.
  • Ensure all reflective tape is clean, in place, in good condition, and free from defects.
  • Use proper visibility devices when carrying unusual loads that project from the rear or sides of the truck.
  • Select paint colors that enhance visibility.

Driver Checklist:

  • Ensure all lights and reflectors are operable and clean.
  • Use extra care when making turns, crossing traffic lanes, or crossing intersections during poor visibility conditions.
  • Exercise extra caution when pulling low-profile trailers, such as empty flatbed tractors, an empty container chassis, construction equipment trailers, or pole trailers.

At JASKO Enterprises, Inc., we take ownership of these checklists, emphasizing the importance of proper lighting and visibility measures to enhance overall road safety.

Ensuring safe cargo transportation is a top priority at JASKO Enterprises, Inc., as heavy, high, and offset loads pose potential risks. Take preventive measures with our comprehensive checklists:

Carrier Checklist:

  • Ensure vehicle and axle weights comply with legal limits.
  • Verify that tire ratings and inflations align with the load and driving conditions.
  • Confirm suspension and coupling ratings are appropriate for the load.
  • Understand the vehicle weight rating and secure any required permits for oversize/overweight loads.
  • Be aware of the vehicle height and plan routes to avoid low bridges, weight-restricted roads, or other impediments.

Driver Checklist:

  • Place the heaviest cargo on the bottom.
  • Ensure heavy articles are not offset to one side of the trailer.
  • Determine payload characteristics when picking up a sealed trailer.
  • Double-check bracing and tie downs when picking up unusual cargo.
  • Ensure the cargo is properly secured.
  • Use reduced speeds, particularly during turns, braking, and adverse weather conditions.
  • Go slower than curve speed signs indicate.
  • Check that tie downs and bracing remain secure throughout the trip, preventing cargo from shifting during transport.

At JASKO Enterprises, Inc., we take ownership of these checklists, prioritizing the safety of both drivers and cargo during transportation.

For more tips on preventive maintenance and inspection practices, contact your transportation agent or visit Sentry Connect® at

Category Task Economy Duty Normal Duty
Engine Volvo Premium Engine Oil, Filters, and Fuel Filters (Replace) Miles 75,000* / 55,000** Miles 60,000* / 55,000**
Valve Adjustment Miles 150,000 / then every 300,000 Miles 240,000 / then every 500,000
Fan and Accessory Drive Belt and Tensioners (Replace) Miles 450,000 Miles 360,000
Coolant Volvo Premium Long Life Coolant (Replace) Miles 750,000
Volvo Premium Extended-Life Coolant Filter (Replace) Miles 150,000
Miscellaneous Transmission and Axles - Volvo I-Shift, Volvo I-Shift Severe Duty*, and Volvo I-Shift with Crawler Gears* Transmission Oil and Filter (Replace) Miles 525,000 Miles 500,000
Electrical System Connectors (Check) Time Every 6 months
Power Steering Fluid and Filter (Replace) Miles 150,000
Exhaust Aftertreatment System Diesel Particulate Filter (Clean) Miles 600,000 Miles 480,000
DEF, Pump, and Tank Filler Neck Filter Miles 300,000
Transmission and Axles Axles - 3 Axle Alignment Time 12 months (minimum)
Transmission Oil and Filter (Replace) Miles 525,000 Miles 500,000
Chassis Volvo Premium Chassis Lubrication Miles 15,000 Miles 10,000
Electrical System Connectors (Check) Time Every 6 months
Power Steering Fluid and Filter (Replace) Miles 150,000
Air Dryer Coalescing Cartridge (Replace) Miles 150,000

Note: Maintenance intervals are applicable to 2022-2025 Volvo VNL760-860 models.

Freightliner Cascadia Maintenance Schedule Maintenance Schedule

Maintenance Schedule

Service Normal – Heavy Duty Severe Duty
Chassis Lube 15,000 mi 10,000 mi
Battery Service 6 months 6 months
3-Axle Alignment Every 12 months Every 12 months
Oil Change/B Service 45,000 mi or 1,300 hours 35,000 mi or 825 hours
Air Filter Fuel Tank Vent 12 months 6 months
Air Dryer Filter 150,000 mi 100,000 mi
Power Steering Fluid/Filter 150,000 mi 150,000 mi
Valve Adjustment 150,000 mi then every 300,000 mi 150,000 mi then every 200,000 mi
DEF System Service 150,000 mi 150,000 mi
AHI Clean/Replace (7th Injector) 150,000 mi 100,000 mi
DPF Filter Clean/Bake 400,000 mi 250,000 mi
Coolant Filter Replace 300,000 mi 150,000 mi
Coolant Replace 750,000 mi 750,000 mi
Transmission Filter/Fluid Replace 500,000 mi or 60 months 250,000 mi or 60 months
Fan/Accessory Drive Belt Replace 300,000 mi 150,000 mi
Differential Oil Replace 250,000 mi 150,000 mi

1-Month Inspection:

Category Checklist
Tires, Wheels & Brakes
  • Check tires for irregular wear
  • Measure tread depth and record
  • Replace missing double check valve caps
  • Check for stem locks on tube type tires
  • Check for proper air pressure and record
  • Inflate tires as required
  • Check wheels for cracks, loose fasteners
  • Check dual mating with tire square
  • Check spare tire carrier
  • Check, adjust all wheel brakes
  • Check oil level in hubs, service as required
  • Lubricate trailer chassis
  • Service gear boxes of landing gear
Lights & Wiring
  • Connect a tractor or portable light tester
  • Check all lights
  • Check reflectors
  • Check for loose or damaged wiring
  • Check cord receptacle condition mounting
Trailer Body
  • Check for body damage
  • Check paint and lettering
  • Check door condition, latches, holdbacks
  • Check operation of overhead door
  • Check floor condition
  • Check roof bows, skin fasteners
  • Light test body
  • Check mud flaps
  • Check license plate and permits
Landing Gear, Kingpin
  • Check landing gear legs, braces
  • Check crank handle, stowage clip
  • Check gear operation
  • Inspect kingpin and upper plate

6-Month Inspection:

Category Checklist
Brake Lining Inspection
  • Remove lower dust shields
  • Record drum condition
  • Record % drum lining left
  • Check wheel bearings
  • Check for oil leaks
  • Lubricate door latches and hinges
Axle Alignment
  • Check & Record alignment measurements
Running Gear
  • Check for air leaks with brakes applied
  • Check hoses and lines for chafing
  • Check air hoses couplers, seals
  • Check relay valve emergency operation
  • Drain moisture from air tanks
  • Check springs, U-bolts, torque arms
  • Check operation of sliding tandem
  • Repaint wheels as required
  • Attach an inspection decal

The Thermo King S-600 Diesel Engine is equipped with a four-cylinder water-cooled, direct injection diesel engine. Below are the service intervals and important information for maintaining optimal performance:

Diesel Engine:

  • The engine is water-cooled and directly coupled to the compressor on standard units.
  • On Smart Power units, a centrifugal clutch transfers power from the engine to the compressor.
  • Belts transmit power to the AC generator, water pump, and alternator.

Extended Life Coolant (ELC):

  • ELC is standard equipment.
  • Maintenance interval for ELC is five years or 12,000 hours.
  • A nameplate on the coolant expansion tank identifies units with ELC.
  • Chevron Extended Life Coolant is RED in color (not GREEN or BLUE-GREEN).

NOTICE: System Contamination! Do not add “GREEN” or “BLUE-GREEN” conventional coolant to cooling systems using “RED” Extended Life Coolant, except in an emergency. If conventional coolant is added to Extended Life Coolant, the coolant must be changed after 2 years instead of 5 years.

Note: The use of 50/50 percent pre-mixed Extended Life Coolant (ELC) is recommended to assure that de-ionized water is being used. If 100 percent full strength concentrate is used, de-ionized or distilled water is recommended over tap water to ensure the integrity of the cooling system is maintained.

EMI 3000 Package:

The EMI 3000 is an extended maintenance interval package that includes the following key components:

  • EMI 3000-Hour Cyclonic Air Cleaner Assembly and Air Cleaner Element.
  • EMI 3000-Hour 5-Micron Fuel Filter.
  • EMI 3000-Hour Dual Element Oil Filter (blue with white lettering).
  • API Rating CJ-4 or CK-4 Oil.
  • Five Year or 12,000 Hour Extended Life Coolant (ELC).

The EMI package allows standard maintenance intervals to be extended to 3,000 hours, or 2 years, whichever occurs first.

The TriPac Evolution APU was designed with an unequaled 2,000-hour maintenance interval, allowing for maintenance to be performed typically only once per year. This schedule aligns better with the tractor maintenance schedule, saving time and eliminating additional downtime for APU maintenance.

APU Maintenance Interval:

Specifications Details
Engine TK270F (Tier 4)
Fuel Type No. 2 Diesel fuel under normal conditions
No. 1 Diesel fuel is acceptable cold weather fuel
Oil Capacity: Crankcase & Oil Filter 6.5 quarts (6.15 liters) maximum
Oil Type API Type CK-4 multigrade oil. FA-4 is not approved.
API Synthetic Type CK-4 multigrade oil is required for units equipped with the optional DPF (Diesel Particulate Filter)
Oil Viscosity 5 to 104 F (-15 to 40 C): SAE 15W-40
-4 to 86 F (-20 to 30 C): SAE 10W-30
Coolant System Capacity (TriPac engine only) 0.6 quarts (0.6 liters) / 2.75 quarts (2.60 liters) with Closed Loop Cooling
Engine Thermostat 160 F (71 C)

NOTICE: Use fuel suitable for the climate you operate in (see truck engine manufacturer’s recommendations). Blending used engine oil with diesel fuel is not permitted in the TriPac system. It will plug the filters and will not allow the air heater to run properly. Thermo King reserves the right to void all warranty on the unit.

Important: The port on top of the engine should not be used to add engine oil. Always add oil through the lower port on the timing gear cover to prevent engine lock-up and/or serious internal damage. Approximately 1.5 quarts (1.4 liters) is required to move the oil level from the lower line (5.1 quarts [4.8 liters]) to the upper line (6.5 quarts [6.2 liters]) on the dipstick.

Category Task Pretrip 500 Hrs Annual 2,000 Hrs
Electrical Check operation of protection shutdown devices.
Check alternator voltage.
Check alternator bearings. See Note.
Inspect battery terminals.
Inspect electrical connections.
Inspect wire harness for rubbing or damage.
Check electric condenser, evaporator, and pre-cooler fans.
Note: With belt removed, spin alternator by hand. Listen for noise and verify bearings roll freely.

Category Task Pretrip 500 Hrs Annual 2,000 Hrs
Structural Visually inspect unit for fluid leaks (coolant, oil, refrigerant).
Visually inspect unit for damaged, loose, or broken parts.
Check APU mounting bolts and brackets for cracks, damage, and poor alignment. Verify tightness and torque to 100 ft/lbs (135.6 N•m) for the claw mount, or 200 ft/lbs (271.2 N•m) for the direct frame mount.

Category Task Pretrip 500 Hrs Annual 2,000 Hrs
Air Conditioning System Check refrigerant level.
Check refrigerant lines for rubbing or damage.
Inspect, clean and (if necessary) replace evaporator air filter. It may be necessary to check or replace it more often if conditions require.
Inspect evaporator drain valves (kazoos) to ensure that they are in place, in good condition and are sealing.
Steam clean condenser and APU pre-cooler coil. Do not bend coil fins.
Blow out evaporator coil and evaporator water drains with air. Do not bend coil fins.

Category Task Monthly Annually
Heater Start and run for at least 20 minutes each month.
Inspect combustion air intake tube and exhaust pipe for restrictions or blockage.
Inspect ducting, air intake screen, and air outlet for restrictions or blockage.
Remove glow pin and inspect for carbon build up. Clean as needed.
Remove glow pin screen and inspect for carbon build up. Replace.
Change fuel pump screen.

Maintenance Inspection Schedule:

  • Thermo King recommends all maintenance and service procedures be performed by an authorized Thermo King dealer.
  • Note: Thermo King reserves the right to deny warranty coverage on claims due to lack of maintenance or neglect. Claims in question must be supported by maintenance records.

Perform the following maintenance tasks at specified intervals to ensure optimal performance of your Carrier Reefer Unit:

Carrier Reefer Unit Maintenance

Maintenance Task Interval
Perform Pretrip Inspection As specified in the Pretrip section
Run Microprocessor Pretrip Before loading
Check Engine Hours Every Service Interval or Yearly
Check engine oil and filter change interval Every Service Interval or Yearly
Check low oil pressure switch Every Service Interval or Yearly
Clean crankcase breather Every Service Interval or Yearly
Check fuel injectors every 1,500 hours* Every Service Interval or Yearly
Check injection pump every 3,000 hours* Every Service Interval or Yearly
Check & adjust engine valves every 4,000 hours Every Service Interval or Yearly
Clean mechanical and electric (if equipped) fuel pump screens Every Service Interval or Yearly
Check & reset air cleaner indicator Every Service Interval or Yearly
Clean battery connections & cable ends Every Service Interval or Yearly
Check battery hold down clamps Every Service Interval or Yearly
Check battery condition Every Service Interval or Yearly
Check starter operation Every Service Interval or Yearly
Check alternator brushes, replace if needed Every Service Interval or Yearly
Check alternator output Every Service Interval or Yearly
Check unit mounting bolts Every Service Interval or Yearly
Check engine & compressor mounting bolts Every Service Interval or Yearly
Check door latches & hinges Every Service Interval or Yearly
Check all belt tensions, adjust as necessary Every Service Interval or Yearly
Check gearbox and fanshaft for oil leaks Every Service Interval or Yearly
Check fanshaft, idler and gearbox bearings Every Service Interval or Yearly
Check clutch air gap, adjust as required Every Service Interval or Yearly
Check compressor drive coupling Every Service Interval or Yearly
Check defrost air switch & calibrate as necessary Every Service Interval or Yearly
Remove bulkhead (if equipped); check & clean the evaporator coil and all defrost drain hoses Every Service Interval or Yearly
Install manifold gauge set & check refrigerant pressure Every Service Interval or Yearly
Run APX Control System Pretrip Every Service Interval or Yearly
Check manual defrost operation Every Service Interval or Yearly
Check unit switches and electrical connections Every Service Interval or Yearly
Check condition of all modules Every Service Interval or Yearly
Drain and flush cooling system 5-year or 12,000 Hour Maintenance
Refill with Extended Life Coolant 5-year or 12,000 Hour Maintenance
Petroleum: 3000 hours or 2 years (Maximum oil drain interval is 2 years) 5-year or 12,000 Hour Maintenance
Mobile Delvac 1*: 4000 hours or 2 years (Maximum oil drain interval is 2 years). (*Mobil Delvac 1 is the only approved synthetic oil) 5-year or 12,000 Hour Maintenance
Adjustments may be needed based on specific models or years. Ensure compliance with EPA regulations (EPA 40 CFR Part 89). Note