Part / Seals (O-ring, oil seal, back-up ring)
BACK UP RING
Catalogue part number OT2BP18 for FLUTEK K3V / K5V tandem pumps. Drawing position 789.
OT2BP18 is the FLUTEK catalogue part number for BACK UP RING in the K3V112 / K5V140 (20-33 t) tandem pump family. It sits at drawing position 789 in the 700 group. It is a service-replacement item, not an assembly, and is picked against the pump serial rather than the machine alone.
Reply within 12 working hours / Single pieces welcome / Send a photo of the old part if you are unsure of the number.
Drawing of the pump family this part belongs to - position numbers match the parts table on the series page.
On this page
Interchange & related numbers
Numbers listed in the same catalogue table for this item, or for the same item on the other model in the family (for example K3V112 vs K5V140, or DT vs DTP). Send the number stamped on your old part and we confirm which one you need.
Same drawing position, other part numbers
Position 789 is shared across the families, but the catalogue number changes with the family and with the control variant (DT / DTP / DTH / SH). Compare before ordering across models - and if two numbers look identical, send us the nameplate and we confirm which one your pump carries.
Frequently ordered with this part
The lines below come from the same pump family and the same catalogue group as OT2BP18. Tick what you need - the list is kept in this browser while you work through the parts pages, and the button sends every ticked number in one message.
| Add | Part name | Part number | Position | Qty/set | Actions |
|---|---|---|---|---|---|
| OORBG145 | 717 | 2 / 4 | Quote | ||
| OORBG145W | 717 | 4 | Quote | ||
| OORBG35W | 702 | 2 | Quote | ||
| OORBG94 | 710 | 1 | Quote | ||
| OORBG95 | 702 / 711 | 2 / 1 | Quote | ||
| OORBG95W | 710 | 2 | Quote | ||
| OORBP11 | 725 | 4 / 8 / 6 / 2 | Quote | ||
| OORBP11W | 725 | 4 / 5 / 6 | Quote |
Nothing is sent automatically: the button opens WhatsApp with the numbers you ticked, and you press send. Seals and servo parts move most often on these pumps, which is why they are listed first.
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Not sure which part failed?
A part number tells you what to order; the diagnosis guides tell you whether that part is what failed. Start from the area that matches the symptom, then come back to the number.
Pump and pressure supply
Pressure, delivery, wear and the case drain test - the checks that decide between a pump and a valve.
Valve and pilot control
Sticking spools, low pilot pressure and proportional solenoid faults.
Oil, filtration and the system
Contamination, water, overheating and the decisions that follow.