Crossbow Maintenance: What to Do, and How Often

Two of those numbers deserve context. The 75-100 shotrail-lube interval is TenPoint’s published guidance for normal conditions, and it is the closest thing the category has to a standard. The 800-1,000 shot / 2-3 yearstring life is the band most makers and custom string shops converge on — TenPoint recommends replacement roughly every three years regardless of shot count, because synthetic string fibers age whether you shoot them or not.

String wax is not lubricant; it is a moisture and abrasion barrier that keeps the individual fibers from drying out and sawing against each other. The technique matters more than the product:

• Wax only the exposed, non-served strands.Run a thin coat along the bare sections of string and cable, then work it into the bundle with your thumb and forefinger or a scrap of leather until you feel heat. That friction is what drives wax between the fibers — wax sitting on the surface has done nothing.
• Do not wax the center serving. The center serving is the tightly wrapped section that rides the rail and contacts the trigger box. Wax there attracts grit, and grit is what actually cuts servings. Condition the servings instead, with the lubricant your manufacturer specifies for them.
• Pay attention to the end loops.The serving wrap where the string bends around the cams takes the sharpest angle on the whole bow. TenPoint specifically calls out conditioning the serving around the end loops, and short axle-to-axle crossbows — the compact designs most hunters now buy — are notably harder on that area because of the extreme string angle.
• Frequency: by appearance, not the calendar. Every two to three sessions is a reasonable default. If the strands look dry, pale or fuzzy, you waited too long.

The flight rail is where the center serving drags at full acceleration, and it is the single highest-wear interface on the bow. TenPoint’s guidance is to lube the rail approximately every 75-100 shotsunder normal conditions — more often in dust, sand or after rain.

The counterintuitive part is that over-lubing is worse than under-lubing. TenPoint states plainly that applying too much lube causes excessive wear on the center serving, and on bows with an integrated cocking unit it can cause the ACUdraw felt pad to fall off. A thin film wiped down to almost nothing is correct; a visible bead is not.

Use a purpose-made crossbow rail lubricant. The silicone-based formulas stay workable in cold weather and shed dirt rather than collecting it — the reason the manufacturers sell their own instead of telling you to use whatever is in the garage. If you shoot a lot, count shots the way you would count rounds: three quivers of practice bolts is roughly 75-100 shots on a busy afternoon.

Crossbows shake themselves apart quietly. Every shot sends a violent pulse through the riser and stock, and over a season that vibration walks fasteners loose. Before each season, and after any trip where the bow rode in a truck bed or a bouncing side-by-side:

While you are in there, look at the limbs themselves in raking light. Hairline cracks, delamination at the tips, and any splintering are stop-shooting-now findings — a service-center problem, not a field-repair one.

Most manufacturers converge on every two to three years, or roughly 800-1,000 shots, whichever arrives first. TenPoint’s own recommendation is about every three years regardless of shot count. Real-world reports run wider than that in both directions — some hunters report needing replacement near 700 shots, some strings survive four or five seasons of light use — because the variables are design and conditions, not just volume.

Replace early, not on schedule, if you see any of these:

• Serving separation.Gaps in the serving wrap that show the string underneath — especially where the serving bends around the cams — is the clearest single signal that a string is done.
• Fuzzing or broken strands on the string or cables that wax will not lay back down.
• Shifted cam timing marks. Most cams carry alignment marks; if they no longer line up, the string has stretched past its usable service life and the bow is out of time.
• Any contact with a sharp edge, a fall, or a dry fire. A dry fire is an automatic full inspection at a service center, not a judgment call.

One design note worth knowing before you shop: short axle-to-axle crossbows are hard on servings. The tight string angle pinches the center serving and wears it faster than a wider bow does. That is a trade, not a defect — you buy the narrow bow for treestand clearance — but budget for string service a little sooner. Our best crossbows roundup notes axle-to-axle width on every pick for exactly this reason.

The off-season damage most people cause is passive. Three rules cover it:

• Never store a crossbow cocked.Not overnight, not "just until tomorrow morning." Leaving the limbs under load takes life out of both the limbs and the string, and a cocked bow in storage is the single most common source of crossbow accidents.
• Store it dry, cool, and out of the case if the case got wet. A soft case that went into the truck damp will hold that moisture against the bow for months. Dry the bow and the case separately.
• Pull the scope battery for long storage if your scope is illuminated. A leaked cell in June is a dead scope in October.

Bolts and broadheads deserve the same attention. Inspect every bolt for cracks, especially carbon shafts, by flexing them and listening — a cracked shaft is the other way people get hurt. Our crossbow bolts guide covers the inspection routine and what spine and weight actually do for you.

1. Never dry fire. Firing without a bolt sends the full energy back into the bow instead of into an arrow. It is the fastest way to destroy limbs, cams and strings, and it voids warranties.
2. Never de-cock by shooting into the ground.It is a good way to damage a bolt in a way you will not see, and shooting that damaged bolt later can cause a catastrophic failure. Use a discharge target, a purpose-made de-cocking bolt, or your bow’s crank de-cocking function — see how to cock and de-cock a crossbow.
3. Never use general-purpose penetrating oil(the aerosol in every garage) on rails, servings or trigger assemblies. It thins the manufacturer’s grease, migrates where it should not, and collects grit.
4. Never over-lube. Repeated because it is the most common self-inflicted wound: excess rail lube accelerates the exact wear it is meant to prevent.
5. Never keep shooting a bow with visible string damage to finish a practice session or a hunt. A string that lets go at full draw releases hundreds of foot-pounds inches from your face.

Run this three to four weeks before opening day — early enough that a service-center finding does not cost you the season.

Step 10 is the one people skip and the one that costs animals. Field points and broadheads do not always print together, and a bow that held zero in a case for nine months has earned a fresh confirmation. Our guide to sighting in a crossbow walks the 20-30-40 yard sequence, and how far a crossbow can shoot covers where to honestly draw your maximum line.