V and VQ Series Vane Pump Cartridge Kits
Matched cartridge kits for V and VQ series vane pumps covering 20V to 4535V and 20VQ to 4535VQ frames, supplied assembled with rotor cam ring vanes and plates.
Product Overview
A cartridge kit is the whole wearing group of a vane pump in one assembled part: rotor, cam ring, vanes, and the port and pressure plates that seal the pair. Changing it returns a worn pump to its original flow without touching the housing, the mounting or the coupling. Our kits cover the full V and VQ range in single and double frames and are assembled and matched as a set rather than picked from loose parts.
| V frames | 20V 25V 35V 45V 2520V 3520V 3525V 4520V 4525V 4535V |
|---|---|
| VQ frames | 20VQ 25VQ 30VQ 35VQ 45VQ 2520VQ 3520VQ 3525VQ 4520VQ 4525VQ 4535VQ |
Key Benefits
- Restores original flow and cycle time at a fraction of the cost of a new pump
- Assembled and matched so all wearing faces run in together
- No change to mounting, coupling or pipework
- Fits inside a normal maintenance window rather than a shutdown
Application Scenarios
- Planned overhaul of press and moulding machine power units
- Emergency repair when a pump has lost flow overnight
- Distributor shelf stock for the frames common in the local market
- Rebuild programmes where several pumps are refreshed in rotation
Who It Is For
- Hydraulic repair shops
- Plant maintenance departments
- Distributors serving industrial customers
- Machine builders offering a service exchange programme
Problems It Solves
- The machine cycle has slowed and flow measurement shows the pump is the cause
- A new complete pump is not justified because the housing is sound
- Loose parts from different sources wear unevenly and fail early
- The original kit is quoted with a long lead time
Technical Features
- Rotor with ground vane slots so the vanes move freely under load
- Profile ground cam ring in bearing quality steel
- Vanes matched to the rotor slot width
- Port plate and pressure plate lapped flat
- Supplied assembled and wrapped so it goes in as one piece
Specifications
Performance figures depend on the exact variant, so we confirm them against your model code rather than publishing a number that may not apply to your pump.
| Kit contents | Rotor, cam ring, vanes, port plate, pressure plate and pins |
|---|---|
| Seals | Cartridge seals included, complete shaft seal kit available separately |
| Assembly | Supplied assembled and matched |
| Frames | All V and VQ single and double frames listed above |
| Marking | Neutral or your own part number on request |
| Packing | Oiled and vacuum sealed in an individual box |
Materials
| Cylinder blocks | Case hardening steel with a sintered bronze running face, bonded and machined after sintering |
|---|---|
| Pistons and shoes | Case hardening steel with a bronze shoe face, swaged and hydrostatically balanced |
| Valve plates | Bearing steel or bronze faced steel depending on the frame, lapped to a mirror finish |
| Drive shafts | Alloy steel, carburised and hardened on the spline and bearing seats, ground on centres |
| Vanes and rotors | High speed tool steel and case hardening steel, hardened and ground on all working faces |
| Cam rings | Bearing quality alloy steel, through hardened then profile ground |
| Seals | Nitrile as standard, fluorocarbon or polyurethane on request for hot or fire resistant fluid duty |
Manufacturing Process
- Turning and millingBlanks are turned and milled from certified bar and forging stock on CNC machines.
- Heat treatmentCarburising, quenching, tempering or nitriding to the route the original part uses.
- GrindingBores, spline seats and running faces are ground after heat treatment so distortion is removed.
- Lapping and superfinishingValve plates, shoe faces and block faces are lapped so the pair seals under pressure.
- InspectionDimensions, hardness and surface finish are recorded against the drawing on a sampling plan.
- Assembly and testComplete pumps are built, run in and tested for efficiency, leakage and noise before packing.
Quality Control
- Incoming material certificates are checked against the grade called for on the drawing.
- Hardness is measured after heat treatment on every batch and recorded on the batch card.
- Critical bores and running faces are gauged against the drawing tolerance, not against a sample part.
- Mating parts are matched as a set so the block, shoes and valve plate run in together.
- Rebuilt pumps are bench tested for volumetric efficiency, external leakage and sound level.
- Parts are cleaned, oiled and vacuum sealed so they arrive without surface rust.
Certifications and Documentation
Supplied on request with an order. We do not claim approvals we cannot evidence.
| Material certificate | Mill certificate for the steel grade used in the batch |
|---|---|
| Hardness report | Surface and core hardness readings after heat treatment |
| Dimensional report | Measured values for the critical features named on the drawing |
| Test bench report | Flow, efficiency, leakage and sound readings for a rebuilt pump |
| Packing list and photographs | Carton contents and photographs of the packed goods before shipment |
Customization Options
- Shaft and splineKeyed, straight or splined shaft ends built to your sample or drawing.
- Port and mountingFlange, thread and mounting pattern matched to the pump already on the machine.
- Seal materialNitrile, fluorocarbon or polyurethane for hot oil, fire resistant fluid or low temperature duty.
- Rotation and displacementLeft or right hand rotation and the displacement code your circuit was set up for.
- Marking and packingNeutral packing, your own carton artwork and your own part number laser marked on the part.
Comparison With Other Products
| Point | Cartridge Kit | Complete Pump | Loose Parts |
|---|---|---|---|
| Cost | Lowest for a sound housing | Highest | Low but risky |
| Fitting time | Short, cover off and cartridge in | Longer, pump off the machine | Long, parts must be matched on the bench |
| Result | Flow returned to original figure | Flow returned to original figure | Depends on how well the parts match |
| Choose when | Housing bore and cover face are not scored | Housing is scored or cracked | Only a single part has failed |
Use Guide
- Drain the pump and mark the cover position before opening.
- Inspect the housing bore and cover face. Scoring means the housing needs attention too.
- Fit the cartridge with the arrow following the drive rotation.
- Renew the shaft seal and cover seal at the same time.
- Flush the reservoir and change filters, then bleed the circuit at low pressure.
Product Photographs
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Frequently Asked Questions
How do I know which cartridge kit to order?
The displacement digits in the pump model code identify the kit. Photograph the nameplate and send it on WhatsApp and we will read the code.
Does the kit include the shaft seal?
Cartridge seals are included. A full shaft seal kit is a separate low cost item and we recommend adding it.
Can I fit a kit without removing the pump?
In most installations yes, if there is room to take the cover off. Otherwise take the pump to the bench.
How long does a cartridge last?
That depends on fluid cleanliness, working pressure and temperature. Changing filters and keeping the oil clean makes the largest difference.
Do you supply kits for double pumps?
Yes. A double pump takes two kits, one per section, and we will list both from your model code.
Send Us the Model Code and We Will Quote
Tell us the model code stamped on the pump, the quantity and your delivery port. A quotation with lead time usually comes back within one working day.