GRECH STRADA – Awning Mechanism Repair and Fabric Replacement

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Awning Mechanism Repair and Fabric Replacement for GRECH STRADA

The Fiamma F45s 250 powered awning on the Grech Strada is a premium unit mounted to the driver-side upper rail of the Sprinter body, just below the custom composite fiberglass upper section — which means any repair work requires extra care not to stress the transition joint between the factory Sprinter steel and the fiberglass cap. Grech uses stainless steel mounting hardware throughout, but where those fasteners thread into the Sprinter’s galvanized body rail, galvanic corrosion can develop silently over time and turn a straightforward fabric swap into a bracket recovery job. The F45s is a cassette-style awning, meaning the fabric and roller are housed in a self-contained aluminum case — this is both a blessing and a curse, because the cassette protects the fabric but traps moisture if the end caps crack. Do this repair on a dry, calm day with a helper; the cassette assembly on the 250cm unit weighs roughly 35–40 lbs and is awkward for one person to control safely.

Required Parts

Step-by-Step Instructions

Step 1: Set Up a Safe Work Zone and Disconnect Awning Power

Before touching any hardware, kill power to the awning motor at the source. The F45s 250 motor lead runs along the Sprinter roofline and drops into the van’s electrical bay behind the driver seat where the Victron MultiPlus-II lives. Trace the awning’s dedicated 12V feed — it typically connects to a fused tap on the house battery bus or a dedicated breaker on the Victron distribution panel. Pull that fuse or trip that breaker and tape it off so nobody re-energizes it while you’re working. Next, set up your work zone: the cassette sits roughly 9 feet off the ground on the Strada’s raised composite roof section, so a standard 6-foot ladder won’t cut it — use an 8-foot or taller stepladder on level ground and clip your safety fall-protection strap to a roof rack point or ladder rung before you ascend. Have your helper stabilize the ladder base throughout. Place a moving blanket or cardboard on the ground directly below the cassette to catch any fasteners or tools. Do not skip the fall protection step — the composite-to-steel roof transition makes the roofline an uneven and non-grippy surface if you slip.

Step 2: Inspect the Mounting Brackets and Check for Galvanic Corrosion

The F45s mounts to the Sprinter body via two or three wall brackets (depending on configuration) bolted through the upper body rail. On the Strada, Grech typically uses M8 stainless hex-head bolts with stainless washers. Using a flashlight and a small mirror, examine each bolt head and the surrounding painted Sprinter steel. White or rust-colored powdery buildup at the bolt-to-steel interface is galvanic corrosion caused by dissimilar metals in contact — stainless and galvanized steel create a small electrochemical cell, especially in wet climates. Attempt to snug each bolt with an 8mm hex key; any bolt that spins freely or feels gritty has likely compromised threads. Do NOT force corroded fasteners — apply penetrating oil and let it soak for 20 minutes before attempting removal. If the body rail threads are stripped, you’ll need to use a larger bolt with a backing nut inside the body cavity or a threaded insert before reinstalling. Photograph the bracket positions before removing anything. Also inspect the cassette end caps for cracks — cracked caps allow water ingress that rots the fabric from the roller outward, and Fiamma replacement end caps are available directly from the manufacturer if yours are damaged.

Step 3: Remove the Cassette Assembly from the Van

With your helper in position, begin loosening the wall brackets. On the F45s, the cassette clips onto the wall brackets via a top-lock channel — you do not fully remove the brackets from the van to drop the cassette. Instead, locate the retention screws on each bracket (Phillips or Torx T25 depending on production year) and back them out two full turns to release the cassette lock. The cassette will now be resting on the bracket hooks. Have your helper support the far end of the cassette while you lift the near end off the first bracket hook, then walk the cassette down together — do not let either end drop freely. Set the cassette on your padded work surface at ground level. If you also need to fully remove the wall brackets (for corrosion repair or resealing), use your 8mm hex key and have a second person hold the bracket from inside the van body cavity if accessible, or use locking pliers as a reaction tool. Dab fresh marine-grade anti-seize on the threads before reinstallation. With the cassette on the ground, use your telescoping awning rod extended to its working length to prop the cassette cover open for access to the roller and fabric inside.

Step 4: Extract the Old Fabric and Assess the Roller Tube

Open the cassette lid fully and look at the roller tube — on the F45s 250, the fabric wraps around a 47mm aluminum extrusion tube that spans the full 250cm width. The fabric attaches at the roller via a flat hem bar that slides into a longitudinal slot on the tube; at the outer edge, the fabric terminates in a sewn channel that fits onto the lead bar (the aluminum bar that unrolls with the fabric). Before pulling the fabric off, mark the roller slot position with a paint marker so you reinstall replacement fabric with identical orientation. Unclip or unscrew the lead bar end caps (two Phillips screws each side), slide the lead bar out of the fabric hem, and set it aside — you’ll reuse this bar. Now pull the fabric hem bar out of the roller slot by sliding it lengthwise off one end. If it’s stuck, the fabric may have swollen from moisture; work it free gently with a plastic trim tool, not a screwdriver. Lay the old fabric flat and measure its width and drop to confirm your replacement fabric dimensions match before proceeding. Inspect the roller tube for dents, cracks, or bent ends — a visibly bowed tube needs to be replaced with a compatible roller tube replacement to ensure even fabric deployment.

Step 5: Install the Replacement Fabric and Lead Bar

Before threading in the new fabric, wipe down the roller tube slot with a dry rag and check that the spring tension mechanism inside the tube is intact — you should feel light rotational resistance when you spin the tube by hand. If the tube spins completely free in both directions, the internal spring is broken and must be re-tensioned or replaced before the fabric goes on, otherwise the awning won’t retract. Assuming tension is good, slide the new fabric’s hem bar into the roller slot from one end, aligning it with your paint marker reference. Feed it the full width until it seats. Pull the fabric over the top of the roller toward the van and confirm the pattern or solid color faces outward (away from the van) when deployed — it’s easy to install upside down. Thread the lead bar back through the sewn channel at the outer fabric edge and reinstall the end caps with their Phillips screws. Tug the fabric firmly side to side to confirm the hem bar is fully seated and won’t pull out under load. Now attach the UV-resistant pull strap to the lead bar’s center D-ring if the original strap was cracked or brittle — UV degradation is the number-one pull strap failure point on awnings that live in the sun year-round.

Step 6: Test and Reinstall the Motor, or Swap to Replacement

Before reassembling the cassette, test the motor while it’s accessible. Temporarily reconnect the motor’s two-wire lead and briefly restore the fuse or breaker you isolated in Step 1 — have your helper watch the roller for smooth rotation in both extend and retract directions. The F45s motor sits inside the cassette at the curb-side end cap, retained by two screws and a snap ring. A healthy motor will sound smooth and consistent; grinding, stuttering, or no movement points to a failed unit. If replacement is needed, the universal replacement motor listed for Solera and Dometic compatible systems will physically fit the F45s roller tube end — verify shaft diameter (typically 10mm hex) and rotation direction match before committing. Swap the motor by removing the end cap screws, withdrawing the old motor, and pressing the new one in until it seats fully against the internal stop. Reconnect the wiring with the same polarity (reverse polarity reverses extend/retract direction). Re-isolate the circuit after the test. Roll the fabric out manually by hand two or three full cycles to confirm the hem bar tracks smoothly and the fabric lays flat with no diagonal creases, which would indicate the hem bar is partially unseated.

Step 7: Reinstall the Cassette, Seal Fasteners, and Add Wind Stabilizers

Lift the cassette back onto the wall bracket hooks with your helper — reverse of the removal process, near end first. Once both ends are hooked, re-engage the retention screws on each bracket and tighten snugly but not torqued aggressively, as over-torquing can crack the cassette mounting ear. Before applying final torque to the wall bracket bolts into the Sprinter body, apply a thin bead of self-leveling lap sealant around each bolt head where it contacts the painted Sprinter steel — this isolates the stainless from the galvanized body and stops the corrosion cycle from restarting. Restore power to the awning circuit and run the motor through three full extend-retract cycles via the switch (located near the Strada’s side door entry area). Watch for even deployment, proper cassette lid articulation, and confirm the lead bar retracts fully flush into the cassette. Extend the awning to its working position and clip the Camco de-flappers onto the lead bar ends — these clamp to the awning arms and bungee to the lead bar, dramatically reducing fabric stress in wind. Finally, extend your telescoping awning rod to use as a secondary support stake when camping in gusty conditions, and note in your van’s maintenance log that bracket fasteners should be re-inspected for corrosion annually, especially after coastal trips.

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