Vickers 3520V / 3520VQ / 3525V / 3525VQ Double Vane Pump: Parts Catalog & Rebuild Guide

Vickers 3520V / 3525V Double Vane Pump: Parts Catalog, Service Data & Rebuild Guide

The Vickers 3520V and 3525V double vane pumps put a 35V shaft end section and a 20V or 25V cover end section on a common shaft in a single housing, giving two independent flows from one drive. The VQ versions use the high performance flex-side plate cartridge. Each end carries its own cartridge kit, sized independently by the displacement codes in the model number, so a correct order needs both tables below. RestoPower supplies OEM or aftermarket equivalent cartridge kits, vane kits, rings, rotors, covers, relief valves and seal kits for every 3520V and 3525V build.

Important note printed on the drawing: use 3520VQ parts to service 3520V-10 and -12 design units.

Exploded View and Parts Diagrams

Vickers 3525VQ double vane pump exploded view diagram with shaft end and cover end cartridge kit tables, seal kit 920056 and bolt torque values

Vickers 3525VQ with both the shaft end and cover end cartridge kit tables.

Vickers 3520VQ double vane pump cover end exploded view with cartridge kit table, cover sub-assembly table and integral relief valve settings

Vickers 3520VQ cover end with its cartridge kit table, cover sub-assembly options and the integral relief valve table. Every part number and torque figure on this page is read off these two drawings.

3525VQ Shaft End Cartridge Kits (35V Section)

SAE Rated Capacity (USGPM) Ring Standard Cartridge Kit F3 Cartridge Kit
21 394961 413420 421582
25 319396 413421 421583
30 319397 413422 421584
35 319398 413418 421585
38 319399 413419 421586

3525VQ Cover End Cartridge Kits (25V Section)

SAE Rated Capacity (USGPM) Ring Standard Cartridge Kit F3 Cartridge Kit
12 326984 421244 421576
14 326985 421235 421577
17 326986 421236 421578
19 326987 421237 421579
21 326988 421238 421580

Cover end common parts: rotor 270597, vane kit 922710 (10 vanes and inserts), inlet support plate 419080, outlet support plate 419079, flex side plate kit 923956, seal pack S/A 433764, pin 422207 (2 req'd), screw 413834 (2 req'd), seal ring 419673, back up ring 588507, O-rings 154095 and 154078.

3520VQ Cover End Cartridge Kits (20VQ Section)

Model Rotor Vane Kit Ring Inlet Support Plate Cartridge Kit F3 Cartridge Kit
3*20*** 5** 402690 922741 333624 419502 417053 421588
3*20*** 8** 402690 922741 333625 419502 417054 421589
3*20*** 9** 402690 922741 374799 419502 423096 423097
3*20***11* 403539 922743 333626 419501 416427 421590
3*20***12* 403539 922743 353901 419501 416428 421591
3*20***14* 403539 922743 353902 419501 416429 421592
3*21*** 5** 428698 922741 333624 419502 428700 428707
3*21*** 8** 428698 922741 333625 419502 428701 428708
3*21*** 9** 428698 922741 374799 419502 428702 428709
3*21***11** 428699 922743 333626 419501 428703 428710
3*21***12** 428699 922743 353901 419501 428704 428711
3*21***14* 428699 922743 353902 419501 428705 428712

The 3*21 rows are the VQ replacement cartridges for the 3521 series. Common parts: outlet support plate 419500, seal pack 433762 S/A (4 req'd), flex-side plate kit 923955, back-up ring 588506, O-rings 154026 and 154090, seal ring 419672, pin 422206 (2 req'd), screw 416426 (2 req'd).

Cover Sub-Assembly by Cover Type

Model Cover Type Cover S/A
3*2*VQ*A*-****20 4-Bolt 250824
3*2*VQ*E*-****20 Straight Thread 252504
3*2*VQ*E*-**2*20 Flow Control 257560
3*2*VQ*E*-**4*20 Flow Control 257561
3*2*VQ*E*-**6*20 Flow Control 257562
3*2*VQ*E*-**7*20 Flow Control 257563
3*2*VQ*E*-**8*20 Flow Control 257564
3*2*VQ*E*-**10*20 Flow Control 257565
3*2*VQ*E*-**12*20 Flow Control 257999

On the 3525VQ the covers are listed as 231532 for the A four bolt flange and 242250 for the E straight thread flange.

Integral Relief Valve by Setting

Model Code Setting (PSI) Relief Valve S/A Model Code Setting (PSI) Relief Valve S/A
C20 750 232794 G20 1750 232798
D20 1000 232795 H20 2000 232799
E20 1250 232796 J20 2250 233019
F20 1500 232797 K20 2500 233020

Relief valve is available on 20VQ cover end models only, and not for the 12 and 14 USGPM ring sizes. Valve detail parts: plug 7077, snap ring 155023, spring 239766. Install the relief valve into the cover before installing the cartridge kit.

Seal Kits

920056 Single Shaft Seal Kit (3525VQ)
920068 F3 Equivalent Shaft Seal Kit
FB-C-10 Mounting Kit

Torque and Assembly Specs

Fastener Applies to Torque
42955 Bolt (4 req'd) 3525VQ inlet housing 140-160 lb.ft, threads oiled
42023 Bolt (4 req'd) 3520VQ inlet body 150 ± 10 lb.ft
11163 Bolt (4 req'd) 3525VQ cover 88-101 N.m (65-75 lb.ft), threads oiled
1296 Bolt (4 req'd) 3520VQ cover 40-50 lb.ft, threads oiled
413834 Screw (2 req'd) 3525VQ cartridge 4-5 N.m (40-50 lb.in)
416426 Screw (2 req'd) 3520VQ cartridge 30 ± 5 lb.in
  • Bronze faces must be installed toward the rotor. This applies to the flex-side plate and the support plates at both ends.
  • Sealing ring 419673: install into the body first, then install the cartridge kit. The cover end equivalent is 419672.
  • Shaft seal: wipe the outside diameter with oil before pressing it into the body, then apply grease to the seal inside diameter before installing the shaft.
  • When ordered individually, flex side plate kit 923956 includes four F3 seal pak sub-assemblies.

Download the Service Data PDFs

How to Rebuild a Vickers 3520V or 3525V Double Vane Pump

A 3520V or 3525V is two vane pumps sharing one shaft and one housing, so treat it as two cartridge jobs done in sequence. The shaft end is a 35V section and the cover end is a 20V or 25V section, and their cartridge kits are not interchangeable. Work out which end has failed before you order parts: very often only one has. Budget three to four hours for a full double rebuild.

Step 1: Identify Which Section Failed

Isolate each outlet and check pressure and flow end by end. A weak cover end with a healthy shaft end is common, because the two sections rarely see the same duty. If the case oil carries metal, rebuild both ends, since the sections share a housing and debris migrates between them.

Step 2: Clean, Drain and Mark

Wash the outside of the pump before anything comes apart and drain the remaining oil. Read the drained oil: bronze glitter points to a cartridge or bearing, steel points to the shaft or a rotor. Scribe the cover to housing relationship and both port positions before undoing anything, and note your cover type, because a flow control or straight thread cover is a different sub-assembly from a plain 4-bolt cover.

Step 3: Remove the Cover and Cover End Cartridge

Remove the four cover bolts evenly in a crossing pattern and lift the cover straight off. If an integral relief valve is fitted, remove it and note its setting code. Withdraw the cover end cartridge as an assembly: inlet support plate, cam ring, rotor with its 10 vanes and inserts, flex-side plate and outlet support plate. Note which face of the cam ring pointed toward the cover, and check the two locating pins have not stayed in the cover.

Step 4: Remove the Shaft End Cartridge

Undo the four inlet housing bolts and separate the housing, then withdraw the shaft end cartridge. Keep the two cartridges separate and labelled; the vane kits and rings look similar between ends but are not interchangeable.

Step 5: Shaft, Bearing and Seal

Remove the retaining rings and press the shaft out from the drive end. Inspect the shaft seal running surface for a wear groove, since a grooved shaft will leak straight through a new seal. Fit shaft seal kit 920056, or 920068 on an F3 build.

Step 6: Inspect and Decide, End by End

  • Cam rings: look for a wear step at the two lift zones on each ring. Any ridge you can feel with a fingernail condemns that whole cartridge kit.
  • Rotor slots: check for bell mouthing at the outer edge, which lets the vanes cock and chatter.
  • Vanes and inserts: chipped or rounded leading edges mean that section has been running cavitated. Fix the inlet or it will happen again.
  • Flex-side plates and support plates: scoring or bronze pickup on the running faces condemns them. Flex side plate kits are 923956 at the shaft end and 923955 at the 20VQ cover end.
  • Relief valve: a valve that will not hold its setting is usually a tired 239766 spring or a scored poppet seat.

Step 7: Reassemble, Torque and Run In

  • Fit complete new cartridge kits at both ends for your capacity codes. Never mix a new cam ring with old vanes; they wear as a matched set.
  • Install the bronze faces toward the rotor and fit sealing ring 419673 into the body before the shaft end cartridge, and 419672 before the cover end cartridge.
  • Install the relief valve into the cover before the cartridge kit goes in.
  • Wipe the shaft seal outside diameter with oil before pressing it in, then grease the seal inside diameter before the shaft goes in.
  • Confirm the locating pins are seated at both ends, and torque the cartridge screws to their low lb.in figures: 4-5 N.m (40-50 lb.in) on a 3525VQ, 30 ± 5 lb.in on a 3520VQ.
  • Prefill both sections with clean oil, then oil the threads and torque the inlet housing bolts to 140-160 lb.ft on a 3525VQ or 150 ± 10 lb.ft on a 3520VQ, and the cover bolts to 88-101 N.m (65-75 lb.ft) or 40-50 lb.ft respectively.
  • Turn the shaft by hand; it should rotate smoothly. Start unloaded at low speed, bleed both circuits, and load each end separately to confirm pressure and flow.

Common 3520V and 3525V Faults

  • One outlet weak, the other fine: that section's cartridge kit only. Rebuild it and check the inlet.
  • Whining or chattering under load: worn cam ring and vanes, or a restricted inlet. Check the inlet first.
  • Oil weeping at the shaft: worn shaft seal, or a grooved shaft if the leak returns quickly.
  • System pressure capped below normal: integral relief valve set low or spring 239766 tired.
  • Leak between body and housing after rebuild: sealing ring 419673 fitted after the cartridge instead of before it.
  • Rapid cartridge failure after rebuild: a bronze face installed away from the rotor.
  • Metal in the case: rebuild both ends, the housing is shared.

Vickers 3520V / 3525V Specifications

  • Type: Fixed displacement double (tandem) balanced vane pump
  • Sections: 35V shaft end plus a 20V, 20VQ or 25V cover end on a common shaft
  • Shaft end capacities: 21 to 38 USGPM. Cover end capacities: 5 to 21 USGPM
  • Vanes: 10 vanes and inserts per VQ cartridge
  • 3525VQ inlet housing bolt torque: 140-160 lb.ft, threads oiled
  • 3520VQ inlet body bolt torque: 150 ± 10 lb.ft
  • Shaft seal kit: 920056, or 920068 F3 equivalent
  • Design note: use 3520VQ parts to service 3520V-10 and -12 design units
  • Compatible brands: Vickers, Eaton Vickers, Danfoss legacy
  • Applications: Machine tools, industrial presses, injection molding, mobile hydraulics

Shop OEM or Aftermarket Equivalent Replacement Parts

Frequently Asked Questions

How do you rebuild a Vickers 3520V double vane pump?

Work out which section failed by checking pressure and flow at each outlet, then scribe the clocking, remove the four cover bolts and withdraw the cover end cartridge, undo the four inlet housing bolts and withdraw the shaft end cartridge, press out the shaft and fit shaft seal kit 920056. Fit complete new cartridge kits at both ends with all bronze faces toward the rotor and sealing ring 419673 installed in the body before the cartridge, then torque the inlet housing bolts to 150 plus or minus 10 lb.ft and the cover bolts to 40-50 lb.ft with the threads oiled, and run each circuit in separately.

What is the bolt torque on a Vickers 3525V?

The four 42955 inlet housing bolts torque to 140 to 160 lb.ft with the threads oiled, and the four 11163 cover bolts torque to 88 to 101 N.m, which is 65 to 75 lb.ft, also oiled. The two 413834 cartridge screws are a much lower 4 to 5 N.m, or 40 to 50 lb.in.

What cartridge kit fits the shaft end of a 3525VQ?

It depends on the SAE rated capacity of that end. A 21 GPM shaft end takes cartridge kit 413420, 25 GPM takes 413421, 30 GPM takes 413422, 35 GPM takes 413418 and 38 GPM takes 413419. The F3 equivalents run from 421582 to 421586.

Can I use 3520VQ parts on a 3520V?

Yes for the -10 and -12 design units. The drawing states directly that 3520VQ parts are used to service 3520V-10 and -12 design units, so the VQ cartridge is the correct service part for those builds.

What seal kit fits a Vickers 3525VQ?

Single shaft seal kit 920056, or 920068 for the F3 equivalent. The mounting kit is FB-C-10. Note that flex side plate kit 923956, when ordered individually, includes four F3 seal pak sub-assemblies.

Related Catalogs

Need help finding the right parts? Contact us at info@restopower.com or call (810) 882-1171 and we will confirm fitment the same day.