SAF-HOLLAND Tire Pilot Plus

Questions and Answers

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whitespencerAug 17, 2025
What to do if tire pressure is high and the warning light is on for SAF-HOLLAND Automobile Accessories?
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  lisawhiteAug 17, 2025
  If the tire pressure is high and the warning light is on, check the following: ensure the incoming pressure is greater than 100psi, or desired tire pressure +10psi (whichever value is higher). Also, ensure the incoming voltage is greater than 12V DC. If these are not the cause, then the pressure protection valve, pressure switch, or solenoid valve may be defective and require replacement. Other possible causes include a regulator that is out of adjustment, corroded butt connectors at the solenoid, or loose/leaking air lines and fittings. In these cases, adjust the regulator, replace the butt connectors, or repair any leaks as needed. Finally, a leaking rotary union or tire hoses may be the source of the problem and require replacement.
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Martin RodriguezAug 21, 2025
What to do if tire pressure is low and the warning light is off for SAF-HOLLAND Tire Pilot Plus Automobile Accessories?
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  Taylor ZavalaAug 21, 2025
  If the tire pressure is low but the warning light is off, check if the regulator is out of adjustment and adjust it. Also, make sure that the supply pressure is a minimum of 10psi greater than the desired tire pressure and that the supply voltage is a minimum of 12V DC; correct these if necessary. Other potential causes include a leaking rotary union or tire hoses, which would need replacement. Finally, ensure the tractor has constant power to the center pin of the 7-way connector (constant blue); if not, update the tractor wiring.
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Christina PalmerAug 25, 2025
What to do if tire pressure is in-spec and the warning light is on for SAF-HOLLAND Tire Pilot Plus?
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  David BrownAug 25, 2025
  If the tire pressure is within the specified range but the warning light is still on, check if the air system valve is closed and open it if necessary. Ensure that the supply pressure is a minimum of 10psi greater than the desired tire pressure, and the supply voltage is a minimum of 12V DC; correct as needed. Other potential causes include a defective pressure protection valve, pressure switch, solenoid valve, or indicator light switch, all of which would require replacement. The regulator might be out of adjustment or defective, and the butt connectors at the solenoid might be corroded; adjust the regulator or replace the connectors/control box assembly as necessary. Also, inspect for loose or leaking air lines or fittings, and a leaking rotary union; repair or replace as needed.
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Joel Shah DVMAug 29, 2025
What to do if brake air tank is de-pressurized or has low pressure in SAF-HOLLAND Tire Pilot Plus?
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  Jacqueline KaufmanAug 29, 2025
  If the brake air tank is de-pressurized or has low pressure, it could be due to a defective pressure protection valve, which requires replacement. It could also be caused by an air leak between the air tank and the pressure protection valve; spray all air lines and fittings with soapy water and repair any leaks that are found.
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leah53Sep 1, 2025
Why is there an air leak from the axle vent in SAF-HOLLAND Automobile Accessories?
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  Donna ParsonsSep 1, 2025
  An air leak from the axle vent may be due to damaged or loose airlines or connections inside the axle; remove the spindle plug assemblies, inspect the air line connections, and repair as necessary. Another possible cause is a leaking rotary union, which would need to be replaced. It could also be caused by loose or leaking air lines and fittings; spray all air lines and fittings with soapy water and repair leaks as needed.
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Dr. Chris WilliamsSep 5, 2025
What to do if tire pressure is high and the warning light is off for SAF-HOLLAND Automobile Accessories?
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  riveracaseySep 5, 2025
  If the tire pressure is high but the warning light is off, ensure that the incoming pressure is greater than 100psi, or desired tire pressure +10psi (whichever value is higher). If the tire pressure is more than 4psi above the regulator setting, excess tire pressure must be manually relieved, as the system is designed to relieve tire pressure up to a maximum of 4psi above the regulator setting.
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Lisa WangSep 9, 2025
What causes an air leak from the tire hose in SAF-HOLLAND Tire Pilot Plus?
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  Mrs. Michelle Russell DDSSep 9, 2025
  An air leak from the tire hose can be caused by overtightened connections. Tire hose fittings should be hand-tightened. Over-tightened fittings can damage the o-rings inside the fitting. Inspect o-rings for damage and replace them if necessary.
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Nicholas MercerNov 12, 2025
What to do if tire pressure is low and the warning light is on for SAF-HOLLAND Automobile Accessories?
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  Stephen NelsonNov 12, 2025
  If the tire pressure is low and the warning light is on, several issues could be the cause. It could be due to a damaged tire, rim, or valve stem, which would require repair or replacement. Another cause could be a closed air system valve, which needs to be opened. Also, check for inadequate supply pressure (it must be a minimum of 10psi greater than the desired tire pressure) and voltage (it must be a minimum of 12V DC) and correct if necessary. Other potential causes include a defective pressure protection valve, pressure switch, or solenoid valve, each requiring replacement. The regulator might be out of adjustment, or defective, and the butt connectors at the solenoid might be corroded, both requiring replacement. Also, check for loose or leaking air lines or fittings, leaking rotary u...

Summary

Safety Alert Definitions

Definition of NOTE

Provides additional information to enable accurate and easy performance of procedures.

Definition of IMPORTANT

Includes additional information that if not followed could lead to hindered product performance.

Definition of CAUTION

Indicates a potentially hazardous situation which, if not avoided, could result in property damage.

Definition of ACAUTION

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.

Definition of AWARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

General and Operational Safety

General and Servicing Safety

Read and observe all Warning and Caution hazard alerts to prevent serious personal injury or component damage.

Operational and Road Safety

Ensure axle load limits are met and follow trailer manufacturer recommendations for off-road operation.

System Identification Guide

Sliding Suspension Identification

Locate the sliding suspension serial tag on the rear crossmember for model identification.

Fixed Frame Identification

Locate the fixed frame suspension serial tag on the frame bracket for model identification.

Tire Pilot Plus Installation Steps

Multi-Axle System Installation

System Performance Verification

The SAF-HOLLAND® Tire Pilot™ Plus System is a tire inflation system designed to maintain optimal tire pressure in trailers, contributing to enhanced performance, durability, and safety. This system draws air from the tractor to pressurize the trailer's tire inflation system.

Function Description:

The primary function of the Tire Pilot Plus system is to automatically monitor and adjust tire pressure to a pre-set level. This helps prevent issues associated with under-inflated or over-inflated tires, such as premature tire wear, reduced fuel efficiency, and potential safety hazards. The system includes a regulator assembly that controls the air pressure supplied to the tires, ensuring consistent inflation. In cases where tire pressure deviates significantly from the set point, a warning light illuminates to alert the operator, indicating that service attention is required. The system is designed to relieve excess tire pressure up to a maximum of 4 psi above the regulator setting, with manual relief needed for higher overpressure conditions.

Important Technical Specifications:

Power Supply: The system requires a minimum of 12 volts DC.
Air Pressure Supply: The incoming air pressure from the tractor must be at least 10 psi greater than the desired tire pressure setting. For high-pressure scenarios, incoming pressure should be greater than 100 psi or the desired tire pressure + 10 psi, whichever is higher.
Leak Rate: During performance testing, the system's leak rate should be less than 1 psi per minute.
Axle Compatibility: The system is compatible with both tapered and parallel spindles.
Multi-Axle Support: For trailers with more than three axles or those requiring two different tire pressure settings, multiple regulator assemblies are necessary. Each regulator assembly will have its own LED warning light.
Air Line Routing: The system utilizes 1/4" DOT tubing for air lines, which are routed through the axle and connected to spindle plugs and a vent fitting. Protective loom is recommended for air lines within the axle and along the trailer sub-frame to prevent chaffing.
Ventilation: Axle vents are crucial for the Tire Pilot Plus system, as it does not vent through the wheel end. Failure to install these vents can lead to pressure buildup and potential wheel end lube leaks.
Warning Light: An LED warning light is installed on the roadside of the trailer, approximately six feet from the bottom, to indicate significant pressure deviations (20 psi or more below the regulator setting).

Usage Features:

Automatic Pressure Regulation: The system continuously monitors and adjusts tire pressure, reducing the need for manual checks and adjustments.
Warning Indicator: An illuminated warning light provides a clear visual alert to the driver when tire pressure falls significantly below the set point, prompting timely maintenance.
Simplified Installation: The manual provides detailed instructions for installation, including drilling and tapping the axle, routing air lines, and connecting the regulator assembly.
Compatibility with Various Suspensions: The system can be installed on both sliding and fixed frame suspensions, with specific serial tag locations for identification.
Off-Road Operation Considerations: The manual emphasizes observing the trailer manufacturer's recommendations for off-road operation to prevent damage and maintain suspension system performance.

Maintenance Features:

Troubleshooting Chart: A comprehensive troubleshooting chart is provided to diagnose common issues, such as low or high tire pressure, and offers possible causes and remedies.
Leak Detection: The system can be leak-checked by installing a pressure gauge on the outlet of the control box and observing the leak rate. Soapy water can be used to identify leaks in air lines and fittings.
Component Replacement: The manual recommends using only SAF-HOLLAND Original Parts for replacements to ensure optimal performance and maintain warranty validity.
Regular Inspections: The system requires periodic checks of air and power supply, regulator settings, and air flow to ensure proper functionality.
Protective Loom: The use of protective loom over air lines is a key maintenance recommendation to prevent chaffing and potential system shutdown.
Hubcap Installation: Proper torque (12-16 ft-lbs in an opposing pattern) for hubcap bolts is specified to ensure secure installation and prevent leaks.
Tire Hose Connections: Tire hose fittings should be hand-tightened to avoid damage to internal O-rings and potential leaks. Regular inspection of O-rings is advised.