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FAAC 402 Compact Hydraulic Operator Repair in Dallas–Fort Worth

Yes, we repair the FAAC 402 — the compact three-foot hydraulic ram on so many residential swing gates. Most 402 calls are a leaf that no longer closes all the way or pushes weakly, and on this operator that is usually oil level, the red and green bypass screws or the triangular release key rather than a failed unit.

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  • 16+ Years Experience
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  • Residential & Commercial

Is this a FAAC 402?

The 402 is FAAC's compact hydraulic ram: a square-section aluminum body about 3½ by 3½ inches and 36 inches long, weighing just over 14 pounds, according to FAAC's 402 manual. The motor, pump, valve assembly and cylinder are all housed in one anodized aluminum oil reservoir, so there is no separate pump box.

Two features identify it quickly. The red and green pressure-adjusting screws sit on top of the operator and are covered by a small nameplate after setup, and the manual release is a triangular key turned on the underside. FAAC documents a CBC version that locks with the piston extended and a CBA version that locks with the piston retracted.

It is easy to confuse with the FAAC 422, which is also compact and hydraulic. FAAC's 2003 manual gives the standard 422 a 38⅞-inch length and a taller 3½ by 4½-inch section, with its bypass valves and release beneath a black plastic locking cap. It is also often mistaken for the much longer FAAC 400.

  • A slim square-section ram roughly 36 in long between post bracket and leaf bracket
  • A nameplate screwed over two pressure screws, red and green, on the top of the body
  • A triangular release fitting on the underside
  • An oil loading cap and a small vent screw at the valve body
  • A 455 D board in the control enclosure (older installs may have a FAAC 450 MPS panel)

Also labelled: 402 CBC, 402 CBA

402 at a glance

Drive
Electro-hydraulic: motor, pump, valves and cylinder in one anodized aluminum oil reservoir
Maximum leaf
10 ft (3 m) and 900 lb (410 kg) per leaf
Dimensions / weight
36 in long, 3½ × 3½ in section, 14⅓ lb
90° opening time
12 seconds
Thrust and traction force
0–1,100 lb
Maximum duty cycle
50% motor run time
Power
115 VAC +10% or 230 VAC +6/−10%, 50–60 Hz
Current draw
2.4 A at 115 VAC · 1.2 A at 220 VAC
Motor
1400 rpm, single-phase, bi-directional; thermal cut-out at 212°F
Operating temperature
−4°F to 131°F
Oil
1½ qt (1.4 L); FAAC XD 220 or Shell Tellus 15
Hydraulic lock
One: CBC locks piston extended, CBA locks piston retracted
Control board (2003 manual)
455 D, force set to 50 for hydraulic operators
UL 325 class (FAAC 2003 table)
Class I — residential

From FAAC’s published documentation. Your unit’s label and manual take precedence.

What your 402 is doing, and what usually causes it

  • The gate stops a few inches short of closing

    Usually: Run time on the board ends before the leaf arrives; bypass pressure too weak so the leaf slips; rear bracket dimensions off so a full swing is impossible; a hinge or obstruction.

    What we do: We follow FAAC's order: clear mechanical obstacles, check the bracket dimensions, then either lengthen the programmed time or raise bypass pressure — never enough to defeat the 33 lb stopping standard.

  • It opens fine but will not close at all

    Usually: A photo-eye or other reversing device held open, a missing jumper where no device is fitted, operator wired incorrectly to the board, or closing-side bypass set too low.

    What we do: We read the FSWOP and FSWCL LEDs on the 455 D, test the reversing devices, then check the closing bypass screw.

  • Oil on the ram, the post or the driveway under it

    Usually: Seal wear, an overfilled operator bleeding from the vent hole, or seals damaged by a vent screw left in or a piston that has been bottoming out.

    What we do: We check level against the ¾-inch mark FAAC specifies and look at why seals failed before fitting the 402 seal kit — otherwise the new seals fail the same way.

  • The gate slams or bangs into the post at the end of travel

    Usually: Piston reaching the end of its stroke before the gate reaches a positive stop, or no slowdown learned on the board.

    What we do: We fit or reset positive stops so the gate stops first, then re-learn times with slowdown. Continued bottoming damages the 402.

  • The remote does nothing, but the wall button works

    Usually: Transmitter battery or code mismatch, receiver wiring, antenna or a blown fuse.

    What we do: As FAAC's troubleshooting suggests, we test with a push button across the activating terminals to split a receiver fault from an operator fault.

  • On windy days the leaf moves or will not hold closed

    Usually: The single hydraulic lock only holds one way, FAAC does not recommend the 402 on solid gates, and FAAC recommends an external lock where wind is strong or gusty.

    What we do: We confirm CBC or CBA and which way it locks, check the bypass settings, and recommend an external lock where FAAC does.

402 down? Tell us what it is doing — we will tell you what it needs.

(214) 735-4314

How the 402 works — and what that means for repair

Light-duty by design

FAAC calls the 402 an automatic, light-duty gate operator for a leaf up to 10 feet long and 900 pounds, with a maximum duty cycle of 50% motor run time. FAAC's 2003 UL class table lists the 402 under Class I, residential — home use or a small building with limited public access — and not under the commercial classes.

FAAC also states the 402 is not recommended for solid gates. A solid leaf catches wind, and a compact ram fighting wind load is a common reason a 402 seems to lose force on gusty days.

Two bypass valves decide how hard it pushes

The two bypass valves on top of the operator control the force applied to the leaf. FAAC's standard, as printed in the 402 manual, is that the leaf should stop if it meets a force greater than 33 pounds. The valves are not preset at the factory, and FAAC warns an unadjusted 402 may move a leaf with enough force to endanger people and damage the gate.

On the 455 D board, FAAC requires force programmed to the maximum of 50 for all hydraulic operators. The valves, not the board, are where a 402 is tuned.

One hydraulic lock, and it is not a security lock

All 402 models in the 2003 manual have one hydraulic lock: CBC locks with the piston extended, CBA with it retracted. FAAC describes the hydraulic lock as a service device rather than a security device, and recommends an additional external lock if the leaf is 10 feet or longer, the site needs tight security or suffers vandalism, the gate sees strong or gusty wind, or there is an open-hold-open device.

That matters for diagnosis. A 402 leaf that can be forced a little in the unlocked direction is behaving as designed; a leaf that drifts in its locking direction is not.

The failures FAAC warns about at installation

Three installation details cause most long-term 402 trouble. The vent screw on the bottom of the valve body must be removed with a 3 mm hex key — FAAC warns that leaving it in can cause erratic operation or blown seals. The piston must never bottom out in either direction, which FAAC says seriously damages the operator. And every leaf needs fixed positive stops in both the open and closed positions, so the gate reaches its stop before the piston does.

The mounting dimensions are tight: FAAC gives A and B of 4½ inches each and C of 35½ inches for an inward-swinging gate, and C of 26½ inches for outward swing. A bracket that has shifted can make a full 90° swing impossible, which FAAC lists as a cause of a gate that does not open completely.

402 parts we repair, adjust or replace

A failed part is not a failed operator. These are the components that actually wear or fail on the 402, and what we do about each.

  • Red and green bypass valves

    Adjusted

    Limit hydraulic force in each direction; covered by a nameplate once set.

    Signs it has failed: Leaf slips short of travel, or pushes harder than FAAC’s 33 lb stopping standard allows.

  • Triangular-key manual release

    Part replaced

    Disengages the hydraulic system so the leaf moves slowly by hand.

    Signs it has failed: Key will not turn, leaf stays free after re-engaging, oil weeping at the release.

  • Oil (FAAC XD 220 or Shell Tellus 15)

    Serviced

    Transmits force and lubricates the pump; 1½ quarts per operator.

    Signs it has failed: Slower, weaker travel; FAAC schedules oil changes every 4 years in light use and every 2 years in heavy use.

  • Seal kit and piston rod packing

    Repaired

    Seal the piston and rod so pressure and oil stay inside.

    Signs it has failed: Oil film on the rod, dropping level, loss of force.

  • Vent screw

    Adjusted

    Must be removed after mounting so the reservoir can breathe.

    Signs it has failed: Erratic travel or blown seals if left in; oil at the vent if overfilled.

  • Lobe pump and 1400 rpm motor

    Part replaced

    Generate the oil flow; the motor shuts off at 212°F to protect itself.

    Signs it has failed: Motor silent with power present, or repeated thermal shutdowns in heavy use.

  • 455 D control panel

    Part replaced

    Logic, learned run times, safety inputs, receiver port and the motor output.

    Signs it has failed: No LEDs, STOP LED out, fuses F1 or F2 open, display not responding to F, + and –.

Repair or replace your 402? The honest answer

On a 402 that is correctly sized for its leaf, repair is almost always right: oil, seals, bypass setting, release and board are all serviceable. The honest exception is a 402 on a gate it was never rated for — a leaf over 10 ft or 900 lb, a solid panel in open wind, or a high-traffic entrance — where it will keep failing however well it is repaired.

Repair it when

  • Short or weak travel on a gate within 10 ft and 900 lb — adjust bypass, check oil and re-learn.
  • Leaking at the rod — seal kit, once the cause (vent screw, bottoming, overfill) is fixed.
  • Release key not engaging — the release assembly is a listed part.
  • Board or receiver fault — replaced without touching the ram.

Replace or upgrade when

  • Leaf heavier or longer than FAAC’s 900 lb / 10 ft rating — the fix is an operator sized for the gate, such as FAAC’s larger 400 ram if the leaf is within its rating.
  • Busy multi-home or commercial entrance — FAAC classes the 402 as Class I residential only.
  • Cylinder or rod physically damaged, often after the piston has repeatedly bottomed out.
Call Now — (214) 735-4314Request a Free Estimate for FAAC 402 repair

Case studies

FAAC repairs we have documented

Other FAAC operators, written up in full — the same diagnose-first approach we take on a 402.

All case studies

Our FAAC work

Photographs from our own FAAC jobs — a mix of models, not all of them the 402. None of it is stock.

  • A FAAC sliding gate operator mounted at the base of a dark aluminium slide gate, with the drive rack visible along the gate frame
  • Close view of a FAAC operator housing opened for service, showing the hydraulic pump and control board inside
  • A FAAC swing gate operator arm connected to a metal driveway gate post
  • A dark metal estate driveway gate closed between stone pillars, fitted with a concealed gate operator

How we diagnose and repair a 402

  1. Confirm it is a 402, and which lock version

    Section, length and the top-mounted red and green screws separate it from a 422 or 400; CBC or CBA tells us which way it should hold.

  2. Disengage with the triangular key and swing the leaf

    We free the hydraulics and move the gate through its full travel by hand, checking hinges, positive stops and whether the piston would bottom out.

  3. Take the ram off to check oil properly

    FAAC’s method is rod fully retracted and pointing down, rear flange removed, level about ¾ inch below the top of the casing. We check the vent screw and seals at the same time.

  4. Set pressure, then the board

    Bypass valves set so the leaf finishes travel yet stops against resistance; 455 D force confirmed at 50; run times re-learned with slowdown.

  5. Quote, repair and test

    You approve the price before work. We finish by testing reversing devices and the release, and refit the nameplate over the pressure screws.

FAAC warranty on the 402

FAAC International's 402 manual states a limited warranty of 24 months from the date of invoice. It applies only to wholesale customers buying through FAAC International's normal distribution channels; FAAC International does not warrant its products to end consumers, who are directed to their selling dealer for that dealer's warranty.

  • Hydraulic oil and filters are listed as maintenance parts that the warranty does not cover.
  • Lightning, power surge, hail, flood, wind storm and improper installation are excluded.
  • Your installer’s invoice date starts any warranty period; ask them what they offer beyond FAAC’s statement.

Our warranty on the repair

Every repair is backed by a clear written warranty. No hidden terms and no confusing fine print: what is covered is explained before we begin, and it is separate from whatever FAAC covers on the operator itself.

What our warranty covers

The 402 in Dallas–Fort Worth conditions

A light-duty ram in long Texas summers

The 402's motor shuts itself off at 212°F and FAAC gives it a 50% maximum duty cycle. A 402 on a busy family gate, in full afternoon sun, cycling several times in quick succession can reach that cut-out and stop until it cools. If your gate quits only on hot, busy afternoons, that is the first thing we check.

FAAC's maintenance schedule has two tracks. Lightly used operators get oil and pressure checks every 12 months and an oil change every 4 years; heavily used ones get checks every 6 months and oil every 2 years. Heat is hard on oil, so we lean toward the shorter schedule for a 402 working through DFW summers.

Storm winds and a single hydraulic lock

FAAC recommends an external lock on a 402 wherever wind is strong or gusty, and advises against solid gates altogether. Spring storm fronts across North Texas put exactly that load on a leaf. A privacy-panel gate on a 402 that "loses pressure" in storms usually needs a lock, not a rebuild.

Moving posts and tight mounting dimensions

With A and B dimensions of just 4½ inches, the 402 has little tolerance for a post that has shifted in expansive clay. A leaning post can stop the gate short of 90° or let the piston bottom out before the leaf meets its stop — the two installation faults FAAC warns about most.

FAAC 402 repair across DFW & Surrounding Areas

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FAAC 402 repair questions

How do I open a FAAC 402 by hand in a power cut?

Fit the triangular key to the release on the underside of the ram and turn it counter-clockwise to disengage the hydraulics — FAAC's manual text says one full turn. Move the leaf slowly, then turn the key clockwise one full turn to re-engage the hydraulics.

What is the weight limit for a FAAC 402?

FAAC's 402 manual rates it for a leaf up to 10 feet long and 900 pounds, and says it is not recommended for solid gates.

How often should a 402 have its oil changed?

FAAC recommends changing oil every 4 years for light use and every 2 years for heavy use, with oil and pressure checks every 12 or 6 months respectively.

Is a FAAC 402 the same as a 422?

No. Both are compact hydraulic rams, but FAAC gives the standard 422 a longer 38⅞-inch body, a taller section and its bypass valves under a locking cap. Seal kits and some parts are specific to each, so we identify the model before ordering anything.

Can a 402 be used on a gated community entrance?

FAAC's UL class table lists the 402 as Class I residential only, with a 50% duty cycle. For a busy shared entrance it is the wrong operator, and we will say so rather than keep repairing it.

Do you stock 402 parts?

Seal kits, hydraulic fluid and common control boards are carried. A release assembly, pump or motor for a 402 is ordered, and we tell you that when we quote.

Request a free estimate for your 402

Leave your name and number, and tell us what the gate is doing. A technician will call you back. If the gate is stuck open or shut, calling is faster — someone always answers.

We'll call you back on this number — we don't sell your details to anyone.

Or call (214) 735-4314 — someone always answers.

Gate Not Working Right Now?

We answer the phone 24/7. If you are stuck, call and we will talk you through the manual release before anyone arrives. See what counts as a gate emergency.

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