GPS Tune Up Kit for Cummins Onan 5500/7000 - Complete Service Kit

In this review the GPS Tune Up Kit for Cummins Onan 5500 and 7000 generators is assessed for RV owners and service techs who want an all-in-one maintenance solution. The bottom line: this kit includes the essential Onan OEM hard parts and the ONAMAX 15W40 oil needed to perform routine service on carbureted HGJAB, HGJAC and commercial HGJAE models, saving time by avoiding multiple parts orders. For anyone maintaining these Onan models, the kit delivers convenience and correct-fit components intended by the manufacturer.

Key Features

• Complete OEM parts: Includes Onan oil filter, air filter, fuel filter and spark plugs to match factory maintenance requirements for the listed models.
• Onamax 15W40 oil included: Two quarts of ONAMAX 15W40 oil are supplied so users can perform an oil change without sourcing compatible lubricant separately.
• Tools for the job: Comes with a cup-type oil filter wrench and a GPS spark plug gap tool to simplify disassembly and correct plug setup.
• Model-specific fit: Parts are selected for Cummins Onan HGJAB, HGJAC and commercial HGJAE carbureted units, reducing the risk of mismatched components.
• OEM part numbers provided: Each included item is listed with its Onan part number so technicians can cross-check or order replacements if needed.

Who It's For

This kit is best for RV owners, fleet maintenance crews and independent technicians who service Cummins Onan 5500 and 7000 generators and prefer to use manufacturer-specified parts and oil. The kit is particularly useful when preparing generators for seasonal use or for routine preventative maintenance where complete coverage of filters, plugs and oil is required.

Those who should look elsewhere include owners of non-carbureted Onan models or different generator brands, and customers who only need a single replacement part rather than a full tune-up package. Also, if a user prefers a different oil formulation, they may choose to purchase oil separately.

Pros & Cons

Pros

• All required hard parts supplied together, making servicing straightforward and efficient.
• ONAMAX 15W40 oil included so users have the correct lubricant on hand immediately.
• Includes simple service tools that reduce the need for additional purchases during a tune-up.

Cons

• Starting in 2022 some units use Fleetguard branded oil filters instead of the Onan-branded filter, so appearance may vary from expectations.

Specifications

Product type	Tune up kit for Onan generators
Compatible models	Cummins Onan 5500 and 7000 (HGJAB, HGJAC, commercial HGJAE)
Oil	ONAMAX 15W40 (QTY 2), PN 326-5336
Oil filter	Onan PN 122-0836 (Fleetguard may be used on later units)
Spark plugs	Onan PN 167-1638 (QTY 2)
Included tools	Cup-type oil filter wrench 420-0577AL; GPS spark plug gap tool PN 627-0560

Our Verdict

The GPS Tune Up Kit is a practical, value-oriented option for anyone maintaining Cummins Onan 5500/7000 carbureted generators because it bundles correct-fit filters, plugs, oil and basic tools into one purchase. For owners who want convenience and confidence that they have manufacturer-recommended parts, this kit is a smart buy and saves time sourcing components individually.

Frequently Asked Questions

Does this kit include oil?
Yes, it includes two quarts of Onan ONAMAX 15W40 oil so you can complete an oil change during the tune-up.

Will the oil filter always be Onan branded?
Starting in 2022 some Cummins units receive Fleetguard branded filters in place of the Onan brand; Fleetguard is part of Cummins Filtration so fit and function remain compatible.

Is this kit compatible with fuel-injected Onan models?
No, this kit is specified for carbureted HGJAB, HGJAC and commercial HGJAE models of the 5500 and 7000 series; confirm your generator model before purchasing.