Tennant T7 / Nobles SSR Leaving Water Behind? The Squeegee & Vacuum Checklist

Your scrubber is running. So why is the floor still wet?

You finish a pass, look back, and there it is: a wet stripe down the middle, little streaks where there shouldn’t be any, or water spilling off the ends of the squeegee every time you turn.

The vac motor sounds fine. No flashing trouble code. The recovery tank isn’t full.

Here’s the good news: most of the time, it’s not the motor. It’s air getting in somewhere it shouldn’t, or a squeegee blade that’s past its best edge. Both are cheap to fix, and most fixes take a few minutes with no tools at all.

In the video below, Josiah Robey of PowerKleen walks through exactly how he diagnoses weak pickup on a Tennant T7 and its twin, the Nobles SSR (Speed Scrub Rider). This post breaks it down step by step so you can follow along right at the machine.

How water gets from the floor to the tank

The T7 and SSR use a simple system. Understand it once and every problem below makes sense.

1. Front squeegee blade has notches that let water in.
2. Rear squeegee blade scrapes that water along with its square edge.
3. Vacuum hose runs from the top of the squeegee to the recovery tank.
4. Vac motor sits in the housing on top of the recovery tank and pulls air (and water) through the whole path.

The key idea: it’s a sealed loop. The motor can only lift water if the air path is tight from the squeegee all the way to the lid. A leak anywhere, even a small one, and suction drops everywhere. Think of it like sipping through a straw with a hole in it.

Step 1: Read what the floor is telling you

Before you touch anything, look at the pattern you’re leaving behind. It points straight at the cause.

What you see on the floor	Most likely cause	Jump to
Water spilling off the ends, especially on turns	Weak suction — air leak or clog	Step 3
One wet stripe right down the middle, sides dry	Squeegee tilted “toes down, butt up”	Step 4
Small, random streaks in odd spots	Worn blade edge or trash caught under the rubber	Step 2
Squeegee barely touching the floor or standing straight up	Squeegee height set wrong	Step 4

Step 2: Check the squeegee blade edge

A rear blade does its job with two things: a square edge and a little bit of bend.

• Square edge. That sharp corner is what actually scrapes water and trash along the floor.
• Slight deflection. Not mashed flat, not standing straight up and fluttering. Just a gentle, even bend across the whole arc.

Get both right and the blade pulls water toward the hose, holds the seal, and keeps suction strong.

Rounded edge? Flip it.

As a blade wears, its working edge rounds off or flattens. Look at the end of an old blade and it can look almost triangular.

The fix is free: every blade has four usable edges. Loosen the knobs, flip or rotate the rubber, and you have a fresh square edge. Flip it, flip it, flip it again — then replace it.

While you’re there, check the front blade for big tears. A large rip lets air in the same way a missing cap would, and suction drops.

The half-second trick for streaks

Seeing thin streaks in random spots, even though pickup is otherwise good? Something is probably stuck under the rubber, letting a trickle of water slip past.

While you’re driving, tap the squeegee button off for half a second, then right back on. The squeegee lifts for an instant, the trash drops out, and it settles back down. The vacuum handles most debris, but larger or odd-shaped pieces can drag under the blade — this clears them without stopping.

Step 3: Hunt down the air leak, top to bottom

Motor running, no error codes, but weak or no suction? Work down the loop in this order. Most machines give up the problem in the first three checks.

1. Vac motor filter

There’s a small filter and gasket at the vac motor inlet. Its job is to stop floating debris and early dust from reaching the motor’s lightweight impellers and bearings. Never run without it.

The filter is one of the cheapest parts on the machine. Replace it if it’s waterlogged (a saturated filter chokes airflow), badly clogged, or just old and funky-smelling.

2. The lid gasket

This outer gasket matters far more than the filter. It’s where the top assembly seals against the recovery tank.

Make sure it’s in one piece, still glued down, and not torn. Occasionally the seal slips past the tank’s edge and sucks air.

The lift test: with the vacuum running, try lifting the lid. It should feel firmly sealed down. If it lifts easily, you’re leaking air there.

3. The recovery tank drain hose cap

If the cap on the dirty water drain hose is loose or knocked off, air rushes in and the tank can’t build the vacuum it needs to lift water. Check it’s on tight.

4. The hand test

If the filter, gasket, and cap are all good, compare suction at two points:

1. Pull the hose off the top of the recovery tank. Put your hand over the opening. You should feel strong suction.
2. Reconnect it, then pull the hose off the squeegee end. Test again.

Suction at the squeegee end should feel about the same as at the tank. It doesn’t have to be overwhelming, but it shouldn’t drop off along the way.

• Strong at the tank, weak at the hose end? Trash is stuck somewhere in the hose. Straighten it out, give it a wiggle, and the clog usually falls free.
• Strong at both? Look inside the squeegee housing itself. Sticks, big flakes of rusty metal, and paper often jam in there and block airflow.

Step 4: Adjust squeegee height and tilt

Lower the squeegee, drive forward, and watch the rear blade. You want a small, even bend across the floor. If it’s standing straight up or not touching at all, you’re losing air pressure.

Blade not touching the floor? Raise the glide wheels.

The squeegee mounting plate rides on two glide wheels. If they’re set too low, they hold the squeegee up off the floor.

1. Turn the key off.
2. Loosen the lock nut on the glide wheel.
3. Thread the wheel up.
4. Retighten the lock nut so it can’t creep.

Wet stripe down the middle? Level the tilt.

If the outsides dry fine but a strip down the center stays wet, the squeegee is sitting “toes down, butt up.” There’s an adjustment bolt on the mounting plate that changes the squeegee’s angle. Turn it to lay the plate flatter until the blade contacts evenly across its whole arc.

This is normally set at the shop and left alone. But backing into a rack or taking a bump can knock the drag bar or bend the mounting tabs out of alignment. The adjustment bolt is the fastest way to dial it back in.

Quick repairs while you’re down there

• Bent mounting plates: straighten them with an adjustable wrench.
• Worn or broken glide wheels: if they’re flopping around or not rolling, replace them. They’re inexpensive and come off by removing the lock nut and threading them out.

The 60-second pickup checklist

Print this and tape it near the charger.

• Rear blade has a square edge (if not, flip it — four edges per blade)
• Blade shows a slight, even bend when down
• Front blade has no big tears
• Vac motor filter is dry and clean
• Lid gasket is intact and seals firmly
• Drain hose cap is on tight
• Suction at the hose end matches suction at the tank
• Nothing jammed inside the squeegee housing
• Glide wheels roll freely and aren’t holding the squeegee up

Still not picking up? We’ll help you find it.

None of these parts are expensive, and almost all of them swap out by hand or with a single tool. The real cost of weak pickup isn’t the part — it’s re-cleaning floors, wet slip hazards, and hours your crew doesn’t get back.

If you’ve worked through the list and your T7 or SSR still leaves water behind, PowerKleen can get you the right parts or put a tech on it.

• Need squeegee blades, a filter, hoses, or glide wheels? Visit our Parts & Assistance page and we’ll match the right part to your machine.
• Want a pro to take a look? Get on the schedule now through our Service Request page.

Prefer to talk it through? Give us a call. We’re happy to help you figure out what’s going on.📞 Call Robey’s PowerKleen Direct: (859) 484-7337 (Monday–Thursday 7am–6pm)