Zodiac Baracuda G3 / G4 / G2 Stops or Crawls: Diaphragm, Foot Pad, Hose Weight — and Which Diaphragm You Have

The Zodiac Baracuda has one moving part. A rubber diaphragm inside the cassette opens and closes under suction, and each closure jerks the head a few centimetres across the floor. Everything else on the machine — foot pad, finned disc, hose, weights, deflector — exists to keep that pulse happening at the right rhythm and to steer where it goes. That simplicity is why the G2, G3 and G4 have stayed in service for twenty years, as common in Australian backyards as in Arizona, and why the machine is cheap to keep alive: when it stops, the fault is in one of four places, and the parts are consumables.

This guide is the diagnostic order for a Baracuda that has stopped, slowed to a crawl, or refuses to leave one spot. Work it top to bottom. Most calls end in the first two steps.

Reading the symptom

The pattern to notice: a stopped or crawling cleaner is a head problem (diaphragm, foot pad). A cleaner that moves fine but goes to the wrong places is a hose and flow problem. Do not swap a diaphragm because the machine circles the drain, and do not add hose weights because the machine will not move.

Prep

Pump off. Lift the cleaner out, disconnect the hose at the head, and stand the head on the deck so the water drains out of the cassette. Everything below is done dry, on a bench or the coping, with no tools beyond your hands — the cassette hand-nut, the foot pad flange and the finned disc all come off by hand.

Before touching the head, though, do the pad check that costs nothing. Is the pump primed and the filter pressure near its clean baseline? A sand or DE filter can be put on recirculate and a cartridge filter run with the cartridge out; if the cleaner comes to life, the filter was the problem, not the cleaner. Are the skimmer and pump baskets empty? Is the suction line to the cleaner fully open at the valve and the other suction lines closed down enough to send flow its way? The Baracuda is a suction cleaner; it can only be as lively as the vacuum you give it.

Start at the diaphragm

Undo the hand-nut and draw the cassette out of the body. Inside, the diaphragm is a soft rubber sleeve on the inner extension pipe, held by a retaining ring, sitting against a compression ring in the cassette chamber. Push the inner pipe through the chamber to expose it.

What you are looking for:

• Tears and pinholes. The smallest split stops the pulse dead. Hold the diaphragm up to the light and flex it; a tear that is closed at rest opens up when stretched.
• A deformed slit. A working diaphragm closes to a narrow, even opening. One that has gone slack, or has stretched into a wide oval, cannot build the pressure differential that makes the pulse. The cleaner will twitch instead of jerk.
• Debris. Pine needles, pebbles and acorn caps lodge in the diaphragm throat and hold it half open. Clearing the throat sometimes revives a "dead" cleaner with no new parts, which is why it is checked first.
• Stiffness. Chlorine and sun harden the rubber over a season or two. A stiff diaphragm pulses weakly and pulses even more weakly in cold water — Zodiac's own manual notes that water at 60°F or below reduces the flexibility of both hose and diaphragm and asks for more flow to compensate. A diaphragm that only works in July is a diaphragm that needs replacing.

Which diaphragm. Two designs cover the G-series. The long-life diaphragm W69698 is the yellow unit Zodiac fits to the G3 Pro and sells as the upgrade for the G2, G3 and G4; it is thicker and slower to stiffen, and it is the one to stock if you only stock one. The standard transparent diaphragm W81701 is the original-style unit and fits the same G2 through G4 cassettes; it is also cross-referenced to the Wahoo diaphragm W81700. Both take the same retaining ring W81600. If in doubt, fit the long-life unit — it fits every G-series cassette in this article.

Refitting is where most DIY jobs go wrong. The compression ring in the cassette chamber must stay in place, and the diaphragm must seat snugly into the chamber end before the inner pipe is pushed back through. A diaphragm that is seated shallow or cocked will pulse poorly or not at all, and the owner will conclude the new part is defective. If the compression ring itself is cracked or has been lost on the deck, W74000 replaces it across the G2, G3, G4, Ranger and Wahoo. If the chamber is cracked — usually from being dropped or from a hand-nut over-tightened onto a body that has been sitting in the sun — the cassette chamber with compression ring W70345 replaces the G3 and G4 chamber and is cross-referenced to W69559, W69563, W70334 and W70667.

If the whole cassette is tired — worn pipe threads, a chewed hand-nut seat — the G3 cassette W70326 (cross-referenced to W69540) or the complete cassette assembly W69994 replaces the lot and saves an hour of fitting individual pieces. On the G4, the outer extension pipe W83271 is the part that usually cracks at the collar.

Foot pad and finned disc

Turn the head over. The foot pad is the black disc at the mouth; the finned disc is the larger flexible skirt around it.

The foot pad has a set of raised grooves on its face. Their job is to let a little water bleed under the pad on each pulse so the head can release from the floor and step forward. When the grooves wear flat — and on a rough plaster or pebble finish they do so in a season — the pad seals to the floor instead. The classic complaint is a cleaner that is "stuck to the bottom and hard to pull off," or that pulses in place without moving. There is no repair for a worn pad; it is a replacement, and it is the second most-replaced part on the machine after the diaphragm.

Pads are model-specific by shape, but the numbers cross-reference to each other more than owners expect: W70327 is the G2 and G3 pad and also fits the G3 Pro and G4; W83275 is the G4 pad and cross-references back to the G2 and G3 numbers; W72855 (turquoise, the Ranger pad) and W69721 (the Pacer pad) both list the G2 through G4 as well. Match the pad to what came off, and if the customer has mixed cleaners on a route, the G2/G3 pad is the safe common stock item. The pad sits on the foot flange W70328 on the G3.

The finned disc wears differently. Look for splits at the fin roots and a stiff, chalky feel. A torn disc lets the head lose its grip on the floor so the pulse pushes the head up instead of forward, and a stiff one will not conform to the floor at all. W70329 is the blue G3 disc, W70464 the G2 disc, and the G4 uses the dual-durometer disc W83277, which has a softer rim bonded to a stiffer centre.

The hose: length, weights, leaks and the Flowkeeper

If the head pulses well on a short test hose but misbehaves in the pool, the hose system is the problem.

Leaks first. With the pump running, lift the hose out of the water a section at a time and listen. Air hissing at a joint is suction that never reaches the cleaner, and a hose that has gone hard and split at the cuff cannot be taped. The long-life hose kit W83140 supplies twelve one-metre sections for the G3 and G4; for a G2 the 1½-inch aqua-blue cleaner hose W20460 matches the original. Check also at the equipment pad — a pump lid o-ring or a suction-side union drawing air will show as bubbles in the pump strainer and will starve the cleaner exactly like a hose leak.

Length. The hose should reach the farthest point of the pool with roughly one section to spare; the manual's fix for poor coverage is to add one or two sections. Too short and the cleaner never reaches the far end and hangs on the wall trying; too long and the excess floats in loops, tangles, and lets the head circle in one area.

Weights. The hose weight is not decoration. It holds the first metre or two of hose down so the head stays on the floor and the hose does not lift it. Zodiac's placement rule for the G3 family is to fit the additional weights about 5 to 8 feet from the cleaner head, and for the G4 to snap one weight one metre from the head. A cleaner that climbs and hangs at the waterline usually has its weight too close to the head; one that sticks in the deep end or on the main drain often has it too far out, or missing. In a deep pool add a weight. The W83247 hose weight fits the Alpha, G2, G3, G4 and Pacer and is cross-referenced to the Kreepy Krauly weights X70105, K12054 and K12454 — useful on a route with mixed cleaners. The G3 also uses the cleaner weight W41079 and float W56124, and the G2 a combined weight and float assembly W70476.

Flow. Too much suction is as bad as too little. A cleaner on a strong single-speed pump will race, climb out at the waterline and hang there, or bury itself on the main drain. Zodiac's answer is the Flowkeeper valve W60050, a spring-loaded regulator fitted in the hose at the skimmer that bleeds off excess suction automatically; it also fits the Ranger, Wahoo and X7 Quattro and is cross-referenced to V60050. Set the flow with the Pool Pulse gauge W44800 where the customer has one — the manual's remedy for a cleaner that will not leave the pool edge is to lower flow, and for one that will not climb, to raise it. If the pool runs a variable-speed pump, the cleaner needs a schedule that gives it real flow; a pump at its filtration speed will barely pulse the diaphragm.

Fittings. The 45-degree elbow W70244 at the skimmer or wall fitting is a common suction-leak point on older installs; the G3's hose connector W33160 and the G4's hose protector sleeve W33800 are the other consumables in the run.

When the head is fine but the pattern is wrong

A G3 that will not leave the main drain, or a G4 that patrols one half of the pool, is steering, not power.

Start with the wheel deflector W83278, the 12-inch ring that bumps the head off walls and steps. A missing or cracked deflector lets the head wedge into corners and under ladders. Then the hose: is it lying in coils from being stored wound up? A hose with coil memory will pull the head in circles until it relaxes — leave it stretched straight in the sun for an afternoon. Then the weight position, per the rule above.

On the G4 the steering is more elaborate: a sail W83261 and a fairing with rudder W83360 on the hose, and left and right fenders W83265 / W83266 on the body. The buoy W83268 keeps the hose off the floor behind the head. On the G2 and G3 the body halves themselves — W69541 left and W69542 right on the G3 — crack at the hand-nut boss after years of over-tightening, and a cracked body draws air and kills the pulse just like a torn diaphragm.

Which cleaner you have

Owners mix the names up, and the parts overlap enough to make it easy. The short identification guide:

• G2 — the older grey body, standard diaphragm, finned disc W70464, foot pad W70327. Cassette parts interchange with the G3.
• G3 — blue finned disc W70329, foot pad W70327, cassette W70326 in chamber W70345. The most common machine in the field.
• G3 Pro — a G3 sold through the trade with the long-life diaphragm W69698 fitted from new and the same cassette, chamber, pad and disc numbers as the G3.
• G4 — dual-durometer disc W83277, foot pad W83275, outer pipe W83271, plus the sail, fairing and fenders. Diaphragm and retaining ring are shared with the G3.

For the complete list of what fits each, see the Baracuda G3, G3 Pro, G4 and G2 model pages, and the full Zodiac compatible range.

Cross-reference table

Numbers in the left column are the OEM references we have verified against the part on the bench; where a Zodiac number maps to more than one of our parts (the foot pads especially), match the shape of the old part rather than the number on the old packaging.

Sourcing

POOLPOINT manufactures the diaphragms, foot pads, discs, cassette parts, hose weights and fittings above factory direct for US distributors, service companies and online sellers. These are the highest-turnover consumables on any suction-cleaner route — a service company typically replaces a diaphragm and a foot pad on every Baracuda it maintains at least once a season — so they suit standing orders in mixed cartons. MOQ starts at 50 pieces per SKU, with private label available. Request a quote for wholesale pricing.