T6 Through-Drive Single Vane Pumps: Driving a Second Pump

Three models, and eleven code positions

The T6 through-drive single pump is a fixed-displacement vane pump built from one cartridge, with one difference that changes its model code: the rear of the shaft carries a second drive, so a second pump can be bolted to the back of the first one.

Three models are built this way: T6CR, T6DR and T6ER. They cover 10.8 to 227.1 cm³/r, and they are written in eleven positions rather than the eight the standard single pumps use.

The three extra positions are exactly the ones the rear drive needs: an adaptor that sets the mounting face for the second pump, a coupling that connects the two shafts, and a porting adaptor for the second pump’s ports.

The eleven positions at a glance

# What it sets Values
1 Model, and the port threads T6CR · T6DR · T6ER, with (Y) for metric threads on the port flanges
2 Displacement (cam ring), written as delivered flow 003–031 on T6CR · 014–050 on T6DR · 042–072 on T6ER
3 Shaft By model: 1 to 5 on T6CR, 1/2/3/5 on T6DR, 1/3/4 on T6ER
4 Rotation R clockwise · L counter-clockwise, seen from the shaft end
5 Porting combination 00 standard · 01 · 02 · 03
6 Adaptor for the driven pump 0 none · A SAE A · B SAE B · C SAE C
7 Coupling 1 SAE A · 2 SAE B · 3 SAE BB · 4 SAE C · 5 SAE J498b, 16/32, 11 teeth
8 Porting adaptor 0 · 1 · 2 · 3, keyed to SAE A, SAE B and SAE C faces
9 Design letter A in the ordering examples for all three models
10 Seal class 1 mineral oil · 4 fire-resistant fluids · 5 both
11 Modification A position of its own; the ordering examples leave it open

Positions 6, 7 and 8 are what separate this code from the standard single pump: they describe the second pump that will be driven, not the first one. A pump ordered without them is a T6CR, T6DR or T6ER whose rear end carries nothing.

Position 1: the model, and the (Y) that follows it

The first position names the model, and it also carries an option written in brackets: (Y) means the port flanges are tapped with metric threads instead of the imperial threads used when it is left out.

Model Frame Cam rings Shaft codes Mounting flange Weight
T6CR C 13 1 · 2 · 3 · 4 · 5 SAE B two-bolt J744, ISO 3019/1 20.4 kg
T6DR D 11 1 · 2 · 3 · 5 SAE C two-bolt J744, ISO 3019/1 32.3 kg
T6ER E 7 1 · 3 · 4 SAE C two-bolt J744, ISO 3019/1 42.5 kg

The weights are the through-drive versions, and they are heavier than the standard single pumps on the same frames, because of what is inside the rear end.

Position 2: the displacement code

The cam ring decides the displacement, and on this range the code is written as the flow the ring delivers at 0 bar and 1500 r/min, so the values are litres per minute.

Code (C frame) Delivery (l/min) Code (C frame) Delivery (l/min)
003 16.2 014 69.0
005 25.8 017 87.4
006 31.9 020 95.7
008 39.6 022 105.4
010 51.1 025 118.9
012 55.6 028 133.2
031 150.0
Code (D frame) Delivery (l/min) Code (D frame) Delivery (l/min)
014 71.4 035 166.5
017 87.3 038 180.4
020 99.0 042 204.0
024 119.3 045 218.5
028 134.5 050 237.0
031 147.4
Code (E frame) Delivery (l/min) Code (E frame) Delivery (l/min)
042 198.5 062 295.0
045 213.6 066 319.9
050 237.7 072 340.6
052 247.2

The C frame covers 10.8 to 100.0 cm³/r, the D frame 47.6 to 158.0 cm³/r and the E frame 132.3 to 227.1 cm³/r. One code appears on more than one frame with a different delivery: 014 is 69.0 l/min on the C frame and 71.4 l/min on the D frame, so the code is read together with the model.

Position 3: the shaft

The shaft code is read across the model, not on its own: the same digit is a different shaft on each of the three.

Code T6CR T6DR T6ER
1 Keyed, SAE BB Keyed, SAE C Keyed, SAE CC
2 Keyed, non-SAE Keyed, SAE CC —
3 Splined, SAE B Splined, SAE C Splined, SAE C
4 Splined, SAE BB — Splined, SAE CC
5 Keyed, non-SAE Keyed, non-SAE —

This is the input shaft, the one the motor or engine drives. The rear end that drives the second pump is not chosen here; it is set by the coupling at position 7.

Position 4: rotation, seen from the shaft end

R is clockwise and L counter-clockwise, both judged from the shaft end. That is also the viewpoint for the porting diagrams, so rotation and porting are settled together against the machine drawing.

Position 5: the four porting combinations

The outlet stays on the upper side of the housing and the inlet moves around it in 90° steps:

Code Outlet and inlet
00 Outlet on the upper side, inlet on the lower side, opposite each other — the standard combination
01 Outlet and inlet both on the upper side, one behind the other along the axis
02 Outlet on the upper side, inlet on the far side, 90° apart
03 Outlet on the upper side, inlet on the near side, 90° apart

Positions 6 to 8: adaptor, coupling and porting adaptor

These three positions describe the rear drive, and they are what makes this code eleven positions long. The adaptor is the mounting face bolted to the back of the pump, and it is chosen in the same SAE letter sizes as a pump flange:

Code Adaptor
0 No adaptor: the rear end is closed
A SAE A face
B SAE B face
C SAE C face

The adaptor face takes the second pump; the two are joined by the coupling, which is chosen at position 7:

Code Coupling
1 SAE A
2 SAE B
3 SAE BB
4 SAE C
5 SAE J498b, 16/32 pitch, 11 teeth

The third of the group, the porting adaptor, sets how the driven pump’s ports are finished, on the same letters:

Code Porting adaptor
0 Standard
1 Keyed to SAE A
2 Keyed to SAE B
3 Keyed to SAE C

The three positions travel together with the second pump’s size: an SAE A driven pump takes an A adaptor and an A coupling, and the porting adaptor follows the same letter. Where nothing is bolted to the rear, all three are written as zero or left as the standard value.

Positions 9 to 11: design letter, seal class and modification

The design letter stands at position 9 and is A in the ordering examples for all three models. Position 10 is the seal class:

Code Class Fluid Shaft seal limit
1 S1 Mineral oil NBR, 0.7 bar maximum
4 S4 Fire-resistant fluids EPDM, 7 bar maximum
5 S5 Mineral oil and fire-resistant fluids FKM, 7 bar maximum

Position 11 is a modification slot. The ordering examples leave it open, and a value there belongs to that build and is carried over as written.

Two torque limits: the pump shaft, and the coupling drive

A through-drive pump carries torque on two shafts, and the catalogue prints a limit for each. The first is the input shaft, read by its shaft code:

Shaft code T6CR (Vi × p) T6DR (Vi × p)
1 21420 43240
2 14300 66036
3 20600 61200
4 32670 —
5 34180 55600

The second limit belongs to the coupling that drives the second pump, and it is read by the coupling code rather than by the pump model:

Coupling Coupling drive (Vi × p)
SAE A 11000
SAE B 20600
SAE BB 22050 on T6CR · 32670 on T6DR and T6ER
SAE C 22050 on T6CR · 37390 on T6DR · 66480 on T6ER
SAE J498b, 11 teeth 15850

The two limits are checked separately, because they are used separately: the input shaft carries the whole drive, while the coupling carries only what the second pump absorbs. When the two pumps are sized so that the second one is small, the coupling limit is rarely the deciding figure; when both are large, it is.

Tandem assemblies: what the rear end drives

A second pump on the rear adaptor makes a tandem assembly, and the catalogue names the combinations by what the second unit is: a vane pump, a piston pump, a gear pump or a hybrid unit. The rear face is bolted with four screws, and the tightening torques are printed by adaptor size:

Adaptor Screw Tightening torque
SAE A M10 × 30 49 N·m
SAE B M12 × 35 88 N·m
SAE C M16 × 40 190 N·m

Two things follow from the arrangement. The second pump’s ports are oriented on the rear face, which has its own set of positions in addition to the four at the shaft end. And the two cartridges work independently, so a tandem can be sized for low flow at high pressure on one section and high flow at lower pressure on the other.

Speed, pressure and weight

The ratings are published per frame, with the top speed and pressure falling as the rings get larger:

Model Displacement Speed Pressure, intermittent / continuous Weight
T6CR 10.8–100.0 cm³/r 600–2800 r/min, 2500 r/min on 025 to 031, 400 r/min minimum with HF-3, HF-4 and HF-5 fluids 275 / 240 bar with HF-0 and HF-2 · 210 / 175 bar with HF-1, HF-4 and HF-5 · 175 / 140 bar with HF-3 · 210 / 160 bar on 028 to 031 20.4 kg
T6DR 47.6–158.0 cm³/r 600–2500 r/min, 2200 r/min on 042 to 050, 400 r/min minimum with HF-3, HF-4 and HF-5 fluids 240 / 210 bar with HF-0 and HF-2 · 210 / 175 bar with HF-1, HF-4 and HF-5 · 175 / 140 bar with HF-3 · 210 / 160 bar on 045 and 050 32.3 kg
T6ER 132.3–227.1 cm³/r 600–2200 r/min, 400 r/min minimum with HF-3, HF-4 and HF-5 fluids 240 / 210 bar with HF-0 and HF-2 · 210 / 175 bar with HF-1, HF-4 and HF-5 · 175 / 140 bar with HF-3 42.5 kg

The intermittent figure is a time-weighted average that may not exceed the continuous rating. The minimum speed is written as two numbers because it moves with the fluid: 600 r/min on mineral oil, 400 r/min on the fire-resistant fluids.

Mounting flange, ports and adaptor screws

The through-drive pump keeps the mounting face and the port sizes of the single pump it is built from, and the rear adaptor adds its own tightening torque:

Model Mounting flange Mounting torque Suction port Pressure port Adaptor screws
T6CR SAE B two-bolt J744 159 N·m 1.1/2 in, Ø 38.1 mm 1 in, Ø 25.4 mm 72 N·m
T6DR SAE C two-bolt J744 187 N·m 2 in, Ø 50.8 mm 1.1/4 in, Ø 31.8 mm 72 N·m
T6ER SAE C two-bolt J744 187 N·m 3 in, Ø 75 mm 1.1/2 in, Ø 37.1 mm 72 N·m

Port sizes do not change because the pump is a through-drive version: they are the ones the same frame uses on the standard single pump. The 72 N·m figure belongs to the two M14 screws that hold the SAE C adaptor.

One selection example, worked through

The catalogue prints an example for this range, and it shows how the two cartridge figures are used together. The requirement is 60 l/min at 1500 r/min and 150 bar:

Step Figure
Displacement needed 40 cm³/r
Model chosen T6CR 014, at 46 cm³/r
Theoretical flow at 1500 r/min 69 l/min
Internal leakage at 150 bar 5 l/min
Effective flow 64 l/min
Theoretical power 17.3 kW
Hydraulic power loss 1.5 kW
Effective input power 18.8 kW

The ring is chosen above the calculated displacement, not at it, and the difference between theoretical and effective flow is the leakage of that ring at that pressure. Both figures come from the tables printed for each model.

One model number, decoded

Six strings from the shelf, read position by position:

Model code Reading
T6CR 003 1L00 A10 A1 Model T6CR, SAE B two-bolt mounting, imperial port threads; cam ring 003 = 16.2 l/min, the smallest ring; shaft 1, keyed SAE BB; rotation L; porting 00; adaptor A (SAE A face), coupling 1 (SAE A), porting adaptor 0; design A; seal 1, NBR
T6CR 006 1L00 C40 A1 The same model and shaft with cam ring 006 = 31.9 l/min, and a rear end for a larger second pump: adaptor C (SAE C face) with coupling 4 (SAE C)
T6CR 008 1L00 B20 A1 Cam ring 008 = 39.6 l/min; adaptor B with coupling 2 (SAE B); porting adaptor 0
T6DR 014 1L00 C40 A1 Model T6DR, D frame; cam ring 014 = 71.4 l/min; shaft 1, keyed SAE C; adaptor C with coupling 4; seal 1
T6DR 020 1L00 C42 A1 Cam ring 020 = 99.0 l/min; adaptor C, coupling 4, and porting adaptor 2 for the driven pump’s ports
T6ER 042 1L00 C42 A1 Model T6ER, E frame; cam ring 042 = 198.5 l/min; shaft 1, keyed SAE CC; adaptor C, coupling 4, porting adaptor 2

Read together, the strings show how the last three positions move as a group: an A adaptor with an 1 coupling on the small frame, and a C adaptor with a 4 coupling when a larger pump is driven off the back.

T6 through-drive: what to confirm before ordering

  • Settle what will be driven. The adaptor, the coupling and the porting adaptor describe the second pump, not the first.
  • Keep the three letters matched. An SAE A driven pump takes the A adaptor with coupling 1.
  • Read the displacement code with the model. 014 is 69.0 l/min on T6CR and 71.4 l/min on T6DR.
  • Check both torque limits: the input shaft by its shaft code, and the coupling by its coupling code.
  • Say whether the ports are metric. That is the (Y) after the model.
  • Confirm rotation and porting together, both read from the shaft end.
  • Match the seal class to the fluid, and take the speed and pressure from the ring rather than the frame.
  • Order the rear screws for the adaptor size: M10 for SAE A, M12 for SAE B, M16 for SAE C.

Ordering

Send the complete code from the nameplate, or the combination you need: model, cam ring, shaft, rotation, porting, adaptor, coupling, porting adaptor, seal class and modification. Where a cartridge kit is wanted instead of a complete pump, say so as well and we will confirm the cartridge against the code before the order is placed.

All pumps are supplied as new replacement units, inspected individually before dispatch.

Browse the T6 single vane pumps, the cartridge kits for the T series, or the wider T6 · T67 · T7 series.

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