• Flail motor 16cc
    Regular price £739.80
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    Flail motor 16cc

    Key Features

    • Displacement: ≈16 cc/rev
    • Series: group 2 gear motor class
    • Use: small flail heads t3/t5
    • Mounting: european group 2 4-bolt; bsp ports
    • Ports: bsp thread ports typical
    Regular price £739.80
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  • Flail motor 34cc - Approved Hydraulics Limited
    Regular price £1,131.82
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    Flail motor 43cc

    Key Features

    • Displacement: ≈43 cc/rev
    • Series: group 2 gear motor class
    • Use: mid-heavy flail heads t7/t9
    • Mounting: european group 2 4-bolt; bsp ports
    • Ports: bsp thread ports typical
    Regular price £1,131.82
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  • Flail motor 8cc PLM20.8.2R0-82E2-LEA/E
    Regular price £432.06
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    Flail motor 8cc PLM20.8.2R0-82E2-LEA/E

    Key Features

    • Displacement: 8.2 cc/rev
    • Series: plm20 group 2 gear motor
    • Rotation: right-hand
    • Use: t1/t3 flail heads; light duty
    • Mounting/ports: european group 2 pattern; bsp ports
    Regular price £432.06
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  • Gear joint
    Regular price £29.32
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    Gear joint

    Key Features

    • Function: couples flail rotor to drive motor
    • Style: gear-type flexible coupling
    • Alignment: tolerates small misalignment ; dampens shock
    • Sizing: select by torque ; bore ; keyway
    • Service: spare element for flail head driveline
    Regular price £29.32
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  • Adam Hindle

    Sales Director

    I began my engineering career at Stockport College in around 2005, first completing a National Diploma in Electrical Engineering, followed by a Higher National Diploma in Mechanical Engineering. I then progressed to the University of Salford, where I earned a BEng (Hons) degree in Mechanical Engineering.

    After graduating, I started my professional career with Approved Hydraulics. I initially gained a combination of hands-on workshop experience and telephone-based sales experience. In later years, I moved into a full-time sales role and led the new crane and excavator attachments department that the company had recently established.

  • Seal kit VAR. PISTON MOT. 64/32 PWG Z15
    Regular price £323.14
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    Seal kit VAR. PISTON MOT. 64/32 PWG Z15

    Key Features

    • Type: variable displacement piston motor seal kit
    • Piston/case sizes: 64 / 32 nominal
    • Content: shaft seal ; variseal ; o-rings ; wear rings
    • Application: pwg z15 motor family
    • Note: match serial for correct revision
    Regular price £323.14
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  • Variseal For Femac T7/T9/T13 22-27-34-43-51cc Motors - Approved Hydraulics Limited
    Regular price £66.06
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    Variseal For Femac T7/T9/T13 22-27-34-43-51cc Motors

    Key Features

    • Seal type: ptfe variseal for high-speed gear motors
    • Motor displacements: 22 ; 27 ; 34 ; 43 ; 51 cc
    • Typical shaft: 22-25 mm id depending on motor series
    • Use: dust ; grit resistant low-friction sealing
    • Note: match seal profile to motor make/model
    Regular price £66.06
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  • Variseal back up washer 18x30
    Regular price £54.76
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    Variseal back up washer 18x30

    Key Features

    • Size: 18 x 30 mm
    • Role: back-up ring to support variseal
    • Material: ptfe or polyamide depending on kit
    • Use: prevents extrusion at pressure
    • Compatibility: pairs with 18 mm shaft variseal elements
    Regular price £54.76
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  • Thrust Plates
    Regular price £8.70
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    Thrust Plates

    Key Features

    • Function: control axial clearance in gear pumps/motors
    • Material: wear-resistant bronze/composite
    • Effect: reduces internal leakage; improves volumetric efficiency
    • Use: service/repair of hydraulic gear units
    • Fit: sized to model series (e.g. LS2035)
    Regular price £8.70
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  • Rotary Shaft seal 17x30x7 R23 High Pressure - Approved Hydraulics Limited
    Regular price £5.94
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    Rotary Shaft seal 17x30x7 R23 High Pressure

    Key Features

    • Size: 17 x 30 x 7 mm
    • Profile: R23 (double lip with dust lip)
    • Rating: high pressure capable (application dependent)
    • Material: oil-resistant elastomer with spring energised lip
    • Use: hydraulic pumps; motors; gearboxes (rotating shafts)
    Regular price £5.94
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  • Allison PTO; CLUTCH; ISO 4 BOLT; HEAVY DUTY; 24V; 1:0,73
    Regular price £1,480.67
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    Allison PTO; CLUTCH; ISO 4 BOLT; HEAVY DUTY; 24V; 1:0,73

    Key Features

    • Product code: TF9063D3ENDP
    • PTO series: TF90 transmission PTO for Allison 3000/4000
    • Input gear: Allison 10.16 P input gear
    • Shift type: 24 V electro hydraulic
    • Output standard: EN DIN 5462 8x32x36 ISO 4 bolt
    • Internal ratio: 1 to 0.73 speed ratio code D
    • Power at 1000 rpm: 107 hp
    • Max torque: 550 lb ft at ratio D; 590 lb ft series max
    • Lubrication: Standard pressure lubrication
    • Mounting: Assembly 3 left forward; rotatable direct mount flanges; weight 62 lb
    Regular price £1,480.67
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  • Allison PTO; CLUTCH; ISO 4 BOLT; HEAVY DUTY; 24V; 1:0,83
    Regular price £1,480.67
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    Allison PTO; CLUTCH; ISO 4 BOLT; HEAVY DUTY; 24V; 1:0,83

    Key Features

    • Product code: TF9063E3ENDP
    • PTO series: TF90 transmission PTO for Allison 3000/4000
    • Input gear: Allison 10.16 P input gear
    • Shift type: 24 V electro hydraulic
    • Output standard: EN DIN 5462 8x32x36 ISO 4 bolt
    • Internal ratio: 1 to 0.83 speed ratio code E
    • Power at 1000 rpm: 94 hp
    • Max torque: 485 lb ft at ratio E; 590 lb ft series max
    • Lubrication: Standard pressure lubrication
    • Mounting: Assembly 3 left forward; rotatable direct mount flanges; weight 62 lb
    Regular price £1,480.67
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    • Order by 3pm for Next Day Delivery
  • Allison PTO; CLUTCH; ISO 4 BOLT; HEAVY DUTY; 24V; 1:1
    Regular price £1,480.67
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    Allison PTO; CLUTCH; ISO 4 BOLT; HEAVY DUTY; 24V; 1:1

    Key Features

    • Product code: TF9063M3ENDP
    • PTO series: TF90 transmission PTO for Allison 3000/4000
    • Input gear: Allison 10.16 P input gear
    • Shift type: 24 V electro hydraulic
    • Output standard: EN DIN 5462 8x32x36 ISO 4 bolt
    • Internal ratio: 1 to 1.00 speed ratio code M
    • Power at 1000 rpm: 78 hp
    • Max torque: 405 lb ft at ratio M; 590 lb ft series max
    • Lubrication: Standard pressure lubrication
    • Mounting: Assembly 3 left forward; rotatable direct mount flanges; weight 62 lb
    Regular price £1,480.67
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    • Order by 3pm for Next Day Delivery
  • Parker / Sterling Proportional Pressure Regulator Cartridge Valve 1.9 LPM - 210 Bar
    Regular price £186.34
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    Parker / Sterling Proportional Pressure Regulator Cartridge Valve 1.9 LPM - 210 Bar

    Key Features

    • Type: proportional pressure reducing cartridge
    • Flow rating: 1.9 lpm nominal
    • Pressure: up to 210 bar maximum
    • Control: current driven coil via PWM driver
    • Use: pilot circuits ; proportional control of downstream pressure
    Regular price £186.34
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  • 1/4" Cylinder Breather
    Regular price £9.08
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    1/4" Cylinder Breather

    Key Features

    • Thread: 1/4" BSP
    • Function: vents cylinder/actuator to atmosphere
    • Element: porous filter to block dust ingress
    • Benefit: prevents vacuum build-up and moisture accumulation
    • Use: protects seals and internal surfaces during stroke
    Regular price £9.08
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  • M5 x 140 Cap head bolt
    Regular price £3.90
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    M5 x 140 Cap head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: M5 (metric)
    • Length: 140 mm
    • Drive: internal hex for accurate tightening
    • Use: manifolds; brackets; pump/motor accessories
    Regular price £3.90
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  • Maxma - MR Hydraulic Motor 200cc 25mm Parallel Key Shaft
    Regular price £156.17
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    Maxma - MR Hydraulic Motor 200cc 25mm Parallel Key Shaft

    Key Features

    • Displacement: 200 cc/rev
    • Shaft: 25 mm parallel keyed
    • Type: hydraulic motor (orbital/gerotor style)
    • Rotation: bi-directional (typical)
    • Use: conveyors; augers; winches; general drives
    Regular price £156.17
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  • CETOP 5 Coil  - 24VDC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £27.13
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    CETOP 5 Coil - 24VDC, (31mm Bore x 75mm long)

    Key Features

    • Interface: CETOP 5
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price £27.13
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  • Single Acting Spool On 'A' Port for AK50 Control Valve
    Regular price £15.19
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    Single Acting Spool On 'A' Port for AK50 Control Valve

    Key Features

    • Spool type: single acting on A port with check on B
    • Neutral: spring centered ; blocked work port in neutral
    • Function: metered raise on A ; gravity return via check
    • Application: SA cylinders ; tipper ; clamps
    • Specification: see product datasheet
    Regular price £15.19
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  • D/A spool for 50L AK electric op valve
    Regular price £16.45
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    D/A spool for 50L AK electric op valve

    Key Features

    • Spool type: double acting cylinder spool for AK 50 valve
    • Neutral: spring centered ; P to T open centre ; A.B blocked options by build
    • Work ports: metered control A ; B in both directions
    • Use: operate DA cylinders ; lift ; tilt functions
    • Notes: confirm spool code against valve plate for symbol matching
    Regular price £16.45
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  • 24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long - Approved Hydraulics Limited
    Regular price £124.93
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    24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long

    Key Features

    • Valve family: HP50 solenoid sections
    • Voltage: 24 VDC
    • Core ; length: Ø 24 mm ; 60 mm long
    • Connector: DIN 43650 Form A
    • Insulation class: Class H typical for DC coils
    • Protection: IP65 with gasketed DIN plug
    Regular price £124.93
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  • 12vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long - Approved Hydraulics Limited
    Regular price £124.93
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    12vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long

    Key Features

    • Valve family: HP50 solenoid sections
    • Voltage: 12 VDC
    • Core ; length: Ø 24 mm ; 60 mm long
    • Connector: DIN 43650 Form A or flying lead ; per build
    • Duty: continuous ; wet armature compatible
    • Protection: IP65 with correct DIN plug
    Regular price £124.93
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  • CARRY OVER PLUG For AK 50 Control Valve - Approved Hydraulics Limited
    Regular price £8.86
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    CARRY OVER PLUG For AK 50 Control Valve

    Key Features

    • Function: power beyond sleeve ; isolates P from T in outlet section
    • Valve family: AK 50 sectional control valves
    • Porting: provides high pressure carry over to downstream valve
    • Installation: fit in outlet body ; tank line must remain to T1.T2
    • Use: extend circuits ; add additional valve stack safely
    Regular price £8.86
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  • Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise - Approved Hydraulics Limited
    Regular price £372.30
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    Clockwise Group 2 Tandem Pump 14cc Front + 14cc Rear 1:8 taper shaft with Flange Ports

    Key Features

    • Sections: tandem two stage ; 14 cc front ; 14 cc rear
    • Rotation: clockwise
    • Ports: typical suction 3/4" BSP ; pressure 1/2" BSP per stage
    • Shaft: 1.8 taper ; 4 bolt EU flange
    • Working pressures: P1 up to 200 bar ; P2 up to 160 bar
    • Speed: up to ~3500 rpm
    • Use: dual circuit mobile hydraulics ; steering ; implements
    Regular price £372.30
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  • CETOP 3 Coil – 220VAC-50HZ  (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.13
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    CETOP 3 Coil – 220VAC-50HZ (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 220 VAC 50 Hz
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with correct DIN plug
    • Notes: ensure AC coil ; armature pairing per manufacturer
    Regular price £13.13
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    • Order by 3pm for Next Day Delivery

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Common Calculations FAQs

Calculating force, speed, pressure, power, and efficiency in hydraulic applications.

How do you calculate actuator speed?

Actuator speed is determined by flow rate and cross-sectional area:

Speed = Flow rate ÷ Area

Flow rate is the volume of fluid delivered (in L/min or GPM).

Area is the cross-sectional area of the actuator piston: π × (diameter ÷ 2)².

How do you calculate cylinder force?

Cylinder force can be calculated using:

Force = Pressure × Area

Pressure is the system pressure (in psi or bar).

Area is the cross-sectional area of the cylinder bore (in square inches or square centimeters).

Area = π × (bore diameter ÷ 2)².

How do you calculate pressure drop across a valve?

Pressure drop can be calculated using the valve flow coefficient (Cv):

Pressure Drop (ΔP) = (Flow Rate)² ÷ (Cv² × Fluid Density)

Flow Rate is the fluid flow (in GPM or L/min).

Cv is the valve flow coefficient.

Fluid Density is the density of the hydraulic fluid.

How do you size an accumulator?

Accumulator sizing considers required flow, pressure, and pre-charge:

Accumulator Volume = Flow Rate × Time ÷ Pressure

This determines how much fluid must be stored to maintain system pressure.

How to convert psi to bar?

Use the conversion factor: 1 bar = 14.5 psi.

To convert psi to bar, divide psi by 14.5.

Example: 200 psi ÷ 14.5 = 13.79 bar.

What is pre-charge pressure in an accumulator?

Pre-charge pressure is the initial gas pressure in the accumulator before fluid enters.

It helps maintain system pressure as the accumulator discharges.

Typically set to 70–80% of system operating pressure.

What is specific gravity of hydraulic fluid?

Specific gravity is the ratio of hydraulic fluid density to water.

A value of 1 means equal density.

Less than 1 means the fluid floats; greater than 1 means it sinks.

What is torque in a hydraulic motor?

Torque is the rotational force produced based on system pressure and motor displacement:

Torque = Pressure × Displacement ÷ 2π

Pressure is the operating system pressure.

Displacement is the volume displaced per revolution (in cubic inches or cubic centimeters).

What unit is hydraulic power measured in?

Hydraulic power is measured in horsepower (HP) or kilowatts (kW).

Hydraulic horsepower can be calculated using:

HP = (Pressure (psi) × Flow rate (GPM)) ÷ 1714.

What’s the relationship between pump speed and flow?

Flow rate is directly proportional to pump speed.

If pump speed doubles, flow rate doubles (assuming constant displacement).

This is important when adjusting flow or selecting a pump for varying speeds.