• 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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  • Sensor - PNEUMATIC W/ 1/8" BSP - Approved Hydraulics Limited
    Regular price £33.34
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    Sensor - PNEUMATIC W/ 1/8" BSP

    Key Features

    • Type: pneumatic pressure sensor/switch
    • Process connection: 1/8" BSP
    • Signal: on/off indication
    • Use: PTO status or hydraulic pressure feedback
    • Mounting: threaded into pneumatic/hydraulic port
    • Compatibility: ABER PTOs/valves with 1/8" BSP ports
    Regular price £33.34
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  • SENSOR FAE 41020 - NC (ISUZU,ZF S5-42,TOYOTA SUP.) - Approved Hydraulics Limited
    Regular price £22.07
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    SENSOR FAE 41020 - NC (ISUZU,ZF S5-42,TOYOTA SUP.)

    Key Features

    • Type: Normally-Closed (NC) electrical sensor
    • Model: FAE 41020
    • Compatibility: ISUZU, ZF S5-42, Toyota (per listing)
    • Function: PTO status/actuation indication
    • Install: mounts to compatible ABER PTO housings
    • Leads: electrical connection suitable for vehicle harness
    Regular price £22.07
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  • Series 100 Single Acting Cylinders - Approved Hydraulics Limited

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    Series 100 Single Acting Cylinders

    Key Features

    • Type: Single acting hydraulic cylinder
    • Max working pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Fluid: Mineral oil to ISO 11158 HM ; HLP
    • Applications: Simple lift ; tilt ; clamp duties on mobile equipment

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  • Team Member

    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.

  • Femac Series 3 Backhoe - Approved Hydraulics

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    Series 3 Backhoe

    Key Features

    • Tractor power: 20-30 hp class
    • Hydraulics: independent system with pump ; tank
    • Rotation: 180° central
    • Stabilizers: independent with block valves
    • Use: light digging ; smallholdings

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  • Series 300 Double Acting Cylinders - Approved Hydraulics Limited

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    Series 300 Double Acting Cylinders

    Key Features

    • Type: Double acting welded cylinder
    • Working pressure: 200 bar nominal ; 250 bar max
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Rod material: C45 hard chrome plated
    • Tube: ST52.3 DIN 2393 honed ; ISO H9 tolerance
    • Fluid: Mineral hydraulic oil

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  • Femac Series 4 Backhoe - Approved Hydraulics

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    Series 4 Backhoe

    Key Features

    • Tractor power: 35-55 hp class
    • Hydraulics: independent system
    • Rotation: 180° central
    • Features: anti-cavitation valves ; floating head
    • Buckets: 300 mm standard ; options available

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  • Series 400 Double Acting Cylinders - Approved Hydraulics Limited

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    Series 400 Double Acting Cylinders

    Key Features

    • Type: Double acting welded cylinder ; heavy duty
    • Working pressure: 200 bar nominal ; 250 bar max
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Construction: Welded steel body ; chrome rod ; honed tube
    • Applications: Mobile equipment ; agricultural ; industrial actuators

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  • Femac Series 5 Backhoe - Approved Hydraulics

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    Series 5 Backhoe

    Key Features

    • Tractor power: 55-90 hp class
    • Hydraulics: independent system ; tank and pump
    • Rotation: 180° central
    • Stabilizers: independent ; check valves
    • Buckets: 250-1200 mm options

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  • Series 500 Front Flange Cylinders

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    Series 500 Front Flange Cylinders

    Key Features

    • Mounting: Front flange welded cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Speed: Up to 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Applications: Mobile ; industrial where flange mount is required

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  • Series 590 Turn Over Plough Cylinders - Approved Hydraulics Limited

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    Series 590 Turn Over Plough Cylinders

    Key Features

    • Application: Turn-over ; reversible plough actuation
    • Action: Double acting
    • Holding: Typically supplied with pilot operated check for safe position holding
    • Working pressure: Up to 250 bar
    • Temperature range: -25 °C to +80 °C
    • Duty: Agricultural implement rotation ; alignment

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  • Femac Series 6 Backhoe - Approved Hydraulics

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    Series 6 Backhoe

    Key Features

    • Tractor power: 75-110 hp class
    • Hydraulics: independent tank ; pump system
    • Rotation: 180° central
    • Stabilizers: independent ; block valves
    • Use: municipal ; farm works

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  • Series 600 Top Link Cylinders - Approved Hydraulics Limited

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    Series 600 Top Link Cylinders

    Key Features

    • Use: Hydraulic top link family for tractors
    • Bore ; rod options: ≈60/35 ; 80/40 ; 100/45 mm depending on model
    • Pressure: 200 bar typical ; 250 bar max
    • Supply: Often supplied complete with hoses
    • Function: Remote implement angle control on 3 point hitch

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  • Series 610 Top Link Cylinders
    Regular price From £178.97
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    Series 610 Top Link Cylinders

    Key Features

    • Use: Hydraulic top link for small ; medium tractors
    • Bore ; rod options: 50/30 mm ; 60/35 mm ; 80/40 mm
    • Stroke options: 160 mm ; 210 mm ; 280 mm
    • Pin sizes: Ø19.3 mm ; Ø25.4 mm depending on build
    • Supply: Delivered complete with hoses
    • Mounting: Three-point hitch top link replacement
    Regular price From £178.97
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  • Series 620 Top Link Cylinders - Approved Hydraulics Limited
    Regular price From £347.89
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    Series 620 Top Link Cylinders

    Key Features

    • Use: Hydraulic top link for medium ; large tractors
    • Bore ; rod range: 60/35 mm up to 100/45 mm options
    • Rated pressure: 200 bar typical ; 250 bar max
    • Check valve: Often supplied with double pilot operated check for position holding
    • Supply: Complete with hoses
    • Applications: Implements angle control ; hitch adjustment
    Regular price From £347.89
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  • Series 630 Top Link Cylinders - Approved Hydraulics Limited
    Regular price £321.35
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    Series 630 Top Link Cylinders

    Key Features

    • Use: Heavy duty top link with quick hitch and rear ball joint
    • Example size: 80 mm bore / 40 mm rod / 200 mm stroke
    • Tractor class: For medium and large tractors
    • Supply: Complete with hoses
    • Mounting: Three-point hitch ; quick coupler compatible
    Regular price £321.35
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  • Series 640 Top Link Cylinders - Approved Hydraulics Limited

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    Series 640 Top Link Cylinders

    Key Features

    • Use: Heavy duty top link variant
    • Mounting: Hitch compatible ; ball ends
    • Rated pressure: 200-250 bar class
    • Supply: Complete with hoses
    • Applications: Demanding agricultural implements

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  • Femac Series 7 Backhoe - Approved Hydraulics

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    Series 7 Backhoe

    Key Features

    • Class: semi-professional backhoe
    • Hydraulics: independent system; 27 cm³/rev pump; 59 l tank
    • Rotation: 180° central; single cylinder
    • Max pressure: 190 bar
    • Bucket: 300 mm std; many options

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  • Series 700 Brake Cylinders - Approved Hydraulics Limited
    Regular price £47.20
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    Series 700 Brake Cylinders

    Key Features

    • Application: Hydraulic brake actuation for agricultural ; mobile equipment
    • Rod options: Ø25 mm ; Ø30 mm variants
    • Working pressure: 200 bar nominal ; 250 bar max
    • Speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Notes: Fork rod end versions suit bogie braking linkages
    Regular price £47.20
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  • Femac Series 7S Backhoe - Approved Hydraulics

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    Series 7S Backhoe

    Key Features

    • Category: professional / industrial backhoe
    • Hydraulics: independent system; 27 cm³/rev pump; multiplier; 59 l tank
    • Rotation: 180° central rotation; patented
    • Max pressure: 190 bar
    • Flow: ≈45 l/min element distributor
    • Bucket: 300 mm standard; wide range optional

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  • Series 800 Crutch Cylinders - Approved Hydraulics Limited

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    Series 800 Crutch Cylinders

    Key Features

    • Application: Crutch ; support leg cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Construction: Welded steel ; chrome plated rod
    • Use: Stabilisers ; props on mobile plant

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  • Series 880 Crutch Cylinders

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    Series 880 Crutch Cylinders

    Key Features

    • Application: Heavy duty crutch ; support leg cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Notes: Designed for higher load support with compact build
    • Use: Stabilisers ; props ; outriggers

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  • shaft collar 45mm - Approved Hydraulics Limited
    Regular price £9.77
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    shaft collar 45mm

    Key Features

    • Type: shaft collar for axial location and load stop
    • Bore size: 45 mm
    • Function: prevents axial movement and component drift on shafts
    • Construction: robust steel collar for high-load environments
    • Use: spacers; stops; locating collars in power transmission
    Regular price £9.77
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  • Shaft Collar 50mm - Approved Hydraulics Limited
    Regular price £10.99
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    Shaft Collar 50mm

    Key Features

    • Type: shaft collar for axial location and load stop
    • Bore size: 50 mm
    • Function: prevents axial movement and component drift on shafts
    • Construction: robust steel collar for high-load environments
    • Use: spacers; stops; locating collars in power transmission
    Regular price £10.99
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All for Professional Hydraulic Applications

Discover quality all from Approved Hydraulics, trusted by professionals across construction, transport, forestry, agriculture and industrial sectors. Built for demanding working environments, our range offers dependable performance, durable construction and trusted reliability. Whether you are replacing existing parts or specifying components for a new build, our experienced team can help you find the right product. With fast UK delivery and expert technical support, Approved Hydraulics supplies hydraulic equipment you can rely on.

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.