• Hydra-PART 180 degree tilting unit for 1 - 3T Excavators Machines Giving  900 N/m Torque
    Regular price £1,440.06
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    Hydra-PART 180 degree tilting unit for 1 - 3T Excavators Machines Giving 900 N/m Torque

    Key Features

    • Machine class: 1–3 t excavators
    • Tilt angle: ±90 deg total 180 deg range depending on install
    • Drive: rotary actuator power tilt
    • Torque: ~900 N.m class
    • Use: fine grading ; ditching ; battering in tight spaces
    Regular price £1,440.06
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  • Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (10 kW Max) with Group 2 Pump
    Regular price £225.66
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    Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (10 kW Max) with Group 2 Pump

    Key Features

    • Gear ratio: 3 ; 1 step up
    • Power rating: 10 kW maximum
    • Input/output: 540 rpm PTO nominal to ~1620 rpm output
    • Shafts: male 1 3/8 inch 6T PTO input
    • Pump interface: Group 2 pump fitted ; suited to lower flow auxiliary circuits
    • Housing: aluminium body ; compact size for light implements
    Regular price £225.66
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £2.40
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    50L Spool Seal Kit (1 x spool)

    Key Features

    • Compatibility: Hydra Part sectional control valves nominal 50 L/min class ; one spool section
    • Intended use: repack a single working section to cure external leaks and spool drag
    • Typical kit contents: spool o rings ; end cap seals ; dust seals used on 50L sections
    • Valve family: 3/8 inch port sectional valve spares range for 50 LPM systems
    • Install tip: clean bore ; lightly lubricate seals ; verify spool end float after rebuild
    • Result: restores smooth lever or solenoid actuation and reduces leakage to atmosphere
    Regular price £2.40
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £19.74
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    HP-20C type Group 2 Pump Seal Kit

    Key Features

    • Compatibility: Hydra Part HP-20C Group 2 gear pumps including common 1.8 taper variants
    • Intended use: replacement of front shaft seal and static seals during pump service
    • Typical kit contents: shaft lip seal ; body o rings and gaskets as required for Group 2 pumps
    • Reference performance: many Group 2 pumps in range rated up to 250 bar continuous service
    • Application: agricultural PTO pumps ; mobile hydraulics ; general industrial systems
    • Service note: inspect shaft journal and bushings ; replace if wear marks exceed spec
    Regular price £19.74
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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.

  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £50.46
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    Baltrotor Seal Kit - GR30, GR30A, GR30PF

    Key Features

    • Compatibility: Baltrotors rotators GR30 ; GR30A ; GR30PF family
    • Rotator type: Grapple rotator with eye upper connection and axle lower mount ; unlimited rotation
    • Intended use: service kit for original seals used in GR30 series rotator heads
    • Typical kit contents: rotary housing ; shaft and port sealing elements needed for leak repair
    • Applications: forestry and small agricultural cranes using GR30 family rotators
    • Fitment note: verify exact GR30 variant before installation to match geometry
    Regular price £50.46
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £25.10
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    Cylinder Seal kit 30-60/70 series 203/303/403/503

    Key Features

    • Compatibility: Hydra Part cylinder series 203 ; 303 ; 403 ; 503
    • Bore sizes: 30 ; 40 ; 50 ; 60/70 mm range options
    • Intended use: complete reseal kit for the listed cylinder families
    • Typical kit contents: seals for piston ; rod ; and wiper plus static rings as used in cylinder rebuild
    • Applications: compact loaders ; attachments ; light industrial rams within these series
    • Selection note: confirm series and bore from cylinder ID to match the correct kit option
    Regular price £25.10
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  • 24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve - Approved Hydraulics Limited
    Regular price £16.46
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    12VDC - 36W- ED 100% Solenoid Only For 45L & 50L Unloader Valve

    Key Features

    • Voltage: 12 vdc
    • Power: 36 w
    • Duty cycle: ed 100% ; continuous
    • Application: coils for 45l ; 50l solenoid operated valves
    • Connector: 4 pin style per data sheet
    • Use: replacement coil only ; valve body not included
    Regular price £16.46
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  • 45L Monobloc Valve Double Acting (Spring only) - Approved Hydraulics Limited
    Regular price £17.75
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    45L Monobloc Valve Double Acting (Spring only)

    Key Features

    • Compatibility: 45l monoblock valve series ; hydra part ; hydrocontrol m45 family
    • Function: spring centered double acting spool positioner ; no detent
    • Spool interface: 16 mm spool diameter per 45l valve spec
    • System pressure (valve body ref): up to 315 bar
    • Flow rating (valve body ref): nominal 45 l/min ; max 65 l/min
    • Control options (valve family): manual lever ; cable ; pneumatic ; electro hydraulic
    • Typical applications (valve family): wood splitters ; agricultural loaders ; small cranes
    Regular price £17.75
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  • 2 Axis Cable Joystick With 2 Electric Buttons & 1m Electric Cable
    Regular price £106.91
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    2 Axis Cable Joystick With 2 Electric Buttons & 1m Electric Cable

    Key Features

    • Applications: mobile hydraulics ; loaders ; cranes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    • Fluid: mineral oil ; 15–75 cSt operating range
    • Max pressure class: up to 315 bar per series
    Regular price £106.91
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  • 80L Control valve Detent Kit In All 3 Positions
    Regular price £31.36
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    80L Control valve Detent Kit In All 3 Positions

    Key Features

    • Series: 80L GS sectional control valve
    • Applications: mobile hydraulics ; loaders ; cranes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    • Fluid: mineral oil ; 15–75 cSt operating range
    • Max pressure class: up to 315 bar per series
    Regular price £31.36
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  • Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 200mm Long - 30mm Dia Ball End
    Regular price £6.05
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    Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 200mm Long - 30mm Dia Ball End

    Key Features

    • Lever thread: M10
    • Overall length: 200 mm
    • Knob diameter: 30 mm
    • Compatibility: 45L ; 80L ; 90L ; 100L ; 120L ; 150L ; 240L valves
    • Use: manual actuation of lever boxes
    Regular price £6.05
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  • 100L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit)  M10x1.5 x 328mm long
    Regular price £24.58
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    100L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit) M10x1.5 x 328mm long

    Key Features

    • Kit: tie rods for 5 bank assembly . 4 rods per kit
    • Thread: m10x1.5
    • Rod length: 328 mm
    • Compatibility: 100l gs sectional valves
    • Function: clamps sections and endplates together
    Regular price £24.58
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  • 80L-100L-150L Control Valve  3/8" Tapered Grub Screw For Carry-over Facility - Approved Hydraulics Limited
    Regular price £1.86
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    80L-100L-150L Control Valve 3/8" Tapered Grub Screw For Carry-over Facility

    Key Features

    • Part: tapered grub screw for carry over facility
    • Thread: 3/8"
    • Compatibility: 80l ; 100l ; 150l valve families
    • Purpose: secures or blanks internal carry over drilling
    • Use: fitted during conversion to power beyond or closed centre
    Regular price £1.86
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  • 90L - 100L - 120 - 150L Control Valve End Cap
    Regular price £4.00
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    90L - 100L - 120 - 150L Control Valve End Cap

    Key Features

    • Function: end cap for spool section ; closes body and retains hardware
    • Compatibility: 90l ; 100l ; 120l ; 150l valve families
    • Options: with stroke limiter ; without stroke limiter
    • Maintenance: allows access to spring or detent kits
    • Typical use: service replacement to restore manual lever feel
    Regular price £4.00
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  • 90L Monobloc Valve 3/4" High Pressure Carry Over Plug
    Regular price £18.53
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    90L Monobloc Valve 3/4" High Pressure Carry Over Plug

    Key Features

    • Function: power beyond ; feeds downstream valve
    • Thread: 3/4" bsp
    • Compatibility: 90l monoblock valves
    • Use case: convert open center valve to series operation
    • System rating: use with host valves up to 315 bar
    Regular price £18.53
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  • 90L Monobloc Valve Motor Spool Type 2
    Regular price £27.36
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    90L Monobloc Valve Motor Spool Type 2

    Key Features

    • Valve: 90L monoblock ; motor spool type 2
    • Function: Spool for hydraulic motor circuits
    • Use: Continuous motor drive with return to tank in neutral
    • Additional info: See product data sheet for detailed measurements
    • Neutral condition: Ports A ; B open in neutral for freewheeling motors
    Regular price £27.36
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  • 80L-90L-100L-120L-150L control valve Detent Kit (9B)  Detent In A Position
    Regular price £43.92
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    80L-90L-100L-120L-150L control valve Detent Kit (9B) Detent In A Position

    Key Features

    • Function: Detent in A position ; positions 0 and B spring centered
    • Kit code: 9B
    • Compatibility: 80L ; 90L ; 100L ; 120L ; 150L control valves
    • Use: Hold spool at full A
    • Additional info: See product data sheet for detailed measurements
    Regular price £43.92
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  • 80L-90L-100L-120L-150L control valve Detent Kit 10B Detent In B Position
    Regular price £37.86
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    80L-90L-100L-120L-150L control valve Detent Kit 10B Detent In B Position

    Key Features

    • Function: Detent in B position ; positions 0 and A spring centered
    • Kit code: 10B
    • Compatibility: 80L ; 90L ; 100L ; 120L ; 150L control valves
    • Use: Hold spool at full B
    • Additional info: See product data sheet for detailed measurements
    Regular price £37.86
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  • 90L-100L-120L-150L Control valve  3 Position Detent Kit (11)
    Regular price £39.60
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    90L-100L-120L-150L Control valve 3 Position Detent Kit (11)

    Key Features

    • Function: 3 position detent ; holds spool in forward and reverse
    • Compatibility: 90L ; 100L ; 120L ; 150L control valves
    • Use: Motor circuits needing maintained actuation or float
    • Install: Replaces end cap hardware on selected spool
    • Additional info: See product data sheet for detailed measurements
    Regular price £39.60
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  • Biodegradable Hydraulic Oil, 205 Litre barrel
    Regular price £704.46
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    Biodegradable Hydraulic Oil, 205 Litre barrel

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: 205 Litre barrel
    Regular price £704.46
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  • Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft (Threaded Ports)
    Regular price £97.98
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    Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft (Threaded Ports)

    Key Features

    • Pump group: Group 2 external gear pump
    • Body: Aluminium body with cast iron end plates
    • Shaft: 1/8 taper keyed
    • Flange: 4 bolt European mount
    • Ports: Inlet 1/2 inch BSPP ; outlet 3/8 inch BSPP typical
    • Displacement range: ≈4 to 30 cc/rev options
    • Continuous pressure: Up to ~250 bar depending on size
    Regular price £97.98
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  • Seal Kit For Hydra Part MR Motor (Zi) - Approved Hydraulics Limited

    POA

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    Motor Seal Kits (ZHE Model)

    Key Features

    • Compatibility: Hydra Part orbital motors ; ZHE model
    • Motor series: MR ; MV
    • Function: Service kit to renew shaft and housing seals ; restore leak tightness
    • Intended fluid: Mineral hydraulic oils to ISO 11158 HM ; HLP
    • Typical maintenance: Replace aged O-rings ; shaft seal when oil leakage or dust ingress occurs
    • Applications: Orbital motors on mobile equipment ; agricultural implements ; conveyors

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • 1" Port, 90°, 3 Hole, 51mm PCD, Female Gear Pump Adaptors
    Regular price £19.04
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    1" Port, 90°, 3 Hole, 51mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: per selection
    • Mounting: 3 hole on 51 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £19.04
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  • 1/2" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors
    Regular price £9.66
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    1/2" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 4 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £9.66
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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.