5 Ways The Xtractor® Hub Cap Reduces Fleet Maintenance Costs
Every wheel-end inspection, oil change, and repair carries a cost in parts, labor, and equipment downtime. The hub cap’s design influences how much work those tasks require and what information technicians have when making maintenance decisions.
TMC’s Recommended Practices establish the importance of lubricant inspection, contamination control, and proper wheel-end maintenance. The Xtractor® makes several of those tasks more accessible through its removable HexThread® front-access cartridge and integrated multistage filtration.
Here are five ways that changes the maintenance process.
1. More Accessible, More Informative Inspections
TMC Basis:
RP 631C, page 10, specifies that lubricant be “visually inspected with a filter” for non-ferrous particles, alongside magnet inspection for ferrous particles. Page 5’s Level 2 inspection also includes lubricant condition and level, smooth wheel rotation, and signs of excessive end play.
With a Standard Hub Cap:
Technicians check oil level through the sight glass, then use separate methods to assess contamination. Ferrous particles can be checked with a magnet; non-ferrous particles require visual inspection using a filter. Access to checking spindle-nut end play require removing the complete cap so the dial indicator can be set in place.
With The Xtractor:
Remove the front cartridge to inspect captured magnetic and non-ferrous material in the integrated filter. The flat face of the hub cap body allows for a dial indicator to be used for end play measurement - no need to remove the hub cap from the hub flange.
The Cost Advantage:
Easier access and visible contamination evidence reduce handling and help technicians identify when further investigation is needed.
2. Simpler, Cleaner Hub Oil Service
TMC Basis:
RP 631C, page 5, directs lubricant replacement “If lubricant is contaminated”. Page 2 addresses component cleanliness and gasket replacement during assembly preparation.
With a Standard Hub Cap:
Depending on the design, technicians drain lubricant through a plug or remove the complete cap. Complete-cap removal adds flange-gasket removal, mounting-surface cleaning, gasket replacement, and reinstallation. Working around a small drain opening can be awkward, while scraping the flange creates debris near wheel-end components.
With The Xtractor:
Drain lubricant through the accessible front cartridge opening, using the drain plug for residual oil as needed. The hub cap body and flange gasket remain installed - avoiding gasket replacement and flange scraping.
The Cost Advantage:
More ergonomic access and fewer flange-related steps reduce labor, cleanup, and opportunities to introduce service debris.
3. Faster Repairs After Damage
TMC Basis:
RP 631C, page 5, instructs technicians to “Check for broken or missing components.” Page 2 also calls for inspecting hub caps and replacing questionable parts. The Xtractor’s cartridge design provides a targeted repair option when damage is confined to that assembly.
With a Standard Hub Cap:
Depending on the damage and cap design, technicians replace the complete cap or perform a multistep disassembly and reassembly using a lens repair kit.
With The Xtractor:
When damage is limited to the HexThread cartridge, replace the assembly containing the sight glass, vent plug, and filter. The cartridge threads off and back on in seconds, followed by tightening to specification. A serviceable hub-cap body stays installed.
The Cost Advantage:
Targeted replacement reduces the parts and labor required when the body and flange connection remain sound.
4. Active Filtration to Help Protect Bearings and Seals
TMC Basis:
RP 631C, page 9, identifies “metallic contamination” in lubricant as a cause of seal failure. Page 10 explains that contaminated oil can lead to repeat seal failures and discusses lubricant replacement and removal of remaining debris. This establishes the importance of contamination control.
With a Standard Hub Cap:
A conventional cap contains the lubricant but provides no integrated filter to capture wear particles circulating within it. Some caps may have a magnet in the drain plug but this cannot capture non-metallic particles.
With The Xtractor:
Submerged multistage filtration combines magnetic capture with mesh filtration to collect ferrous wear material and fine non-magnetic particles.
The Cost Advantage:
Capturing abrasive contamination helps manage a source of component wear, supporting the fleet’s effort to keep bearings and seals in service through their intended lifecycle.
5. Faster Preventive Maintenance with Better Information
TMC Basis:
RP 631C, page 5, identifies the Level 2 interval as “100,000 miles or Annual Inspection”. Its checks include leakage, lubricant level and condition, smooth wheel rotation, and excessive end play. The Xtractor’s accessible filter gives technicians additional evidence to inform that maintenance process.
With a Standard Hub Cap:
Lubricant assessment, particle checks, and component access may involve separate tools and handling steps. Technicians must gather enough information to determine whether routine service is sufficient or deeper work is needed.
With The Xtractor:
Front access brings lubricant access and filter inspection together at one service point. Technicians can examine captured material and use their findings to guide further checks under the fleet’s maintenance procedures.
The Cost Advantage:
A simpler workflow helps routine PM move through the shop while providing additional evidence for deciding which wheel ends need further attention.
Make Necessary Maintenance Easier
The Xtractor’s value builds each time a wheel end returns for service: easier inspection, simpler lubricant access, targeted repairs, and contamination capture.
That is the thinking behind The Hub Corporation’s Controlled Operating Environment™ - giving fleets greater control over how their wheel ends are protected, inspected, and serviced.
Use our fleet cost-savings calculators to compare your equipment population, maintenance schedule, and labor costs.
Challenge the Standard®. Give your fleet a better way to inspect, protect, and service its wheel ends.
References: TMC RP 631C, Recommendations for Wheel End Lubrication, revised October 2019.
