• 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
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    25mm Straight Keyed Shaft For MR Motors (Zi)

    Key Features

    • Interface: 25 mm straight keyed shaft
    • Compatibility: MR series hydraulic motors
    • Keyway: parallel key for positive torque transfer
    • Use: couples motor output to hubs; pulleys; couplings
    • Material: alloy steel for durability
    Regular price £38.16
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  • 6 Splined SAE "B" Shaft For MP And MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £32.44
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    6 Splined SAE "B" Shaft For MP And MR Motors (ZHE)

    Key Features

    • Spline profile: SAE 6B straight sided 1" 6-tooth per ANSI B92.1 class B
    • Major diameter: 1.000 in nominal for SAE 6B
    • Compatibility: M+S MP ; MR orbital motor shaft option
    • Use: replacement output shaft for LSHT motors
    • Material: steel ; typically hardened at spline flanks
    • Mating hub: SAE 6B internal spline hub
    • Typical applications: drives using 1 in 6B spline couplings ; gearboxes ; hubs
    Regular price £32.44
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  • Seal Kit For Hydra Part MR Motor (Zi) - Approved Hydraulics Limited
    Regular price £27.40
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    MR motor seal kit (ZI)

    Key Features

    • Compatibility: M+S MR series orbital motors series 3 ; series 4
    • Shaft seal: 28.56 x 42 x 5.5 mm NBR typical
    • Dust seal: 28.5 x 35 x 2 mm
    • O rings: 48 x 2 mm ; 90 x 2 mm x3
    • Purpose: restores sealing to reduce leakage and maintain pressure
    • Use: service kit for MR motor overhaul ; maintenance
    • Notes: check shaft code ZI ; different seals exist for ZH ; ZK variants
    Regular price £27.40
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  • 1" Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
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    1" Straight Keyed Shaft For MR Motors (Zi)

    Key Features

    • Interface: 1" straight keyed shaft
    • Compatibility: MR series hydraulic motors (Zi)
    • Keyway: parallel key for positive torque transfer
    • Retention: snap ring/retainer provision (motor dependent)
    • Material: alloy steel for wear resistance
    • Use: adapts motor to couplings; hubs; pulleys
    Regular price £38.16
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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.

  • Intermercato seal kit for RX 120-390 rotator - Approved Hydraulics Limited
    Regular price £130.07
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    Intermercato seal kit for RX 120-390 rotator

    Key Features

    • Type: OEM rotator seal kit
    • Compatibility: model stated in title
    • Contents: rod seals ; piston seals ; O rings ; wear rings
    • Media: mineral hydraulic oil service
    • Use: restore leak tightness and rotational performance
    Regular price £130.07
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  • Complete Cylinder for Intermercato GRX15 Grab- Part book item No.8
    Regular price £625.26
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    Complete Cylinder for Intermercato GRX15 Grab- Part book item No.8

    Key Features

    • Type: complete double acting hydraulic cylinder assembly
    • Compatibility: factory replacement for listed TG or GRX models
    • Seals: high pressure rod and piston seals with wiper installed
    • Ports: BSPP per OEM specification
    • Testing: pressure tested for leakage and function
    • Use: restores lifting and clamping performance
    Regular price £625.26
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  • ABER QUILL SHAFT ADAPTER KIT FOR ZF 16S181  Z=14
    Regular price £135.74
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    ABER QUILL SHAFT ADAPTER KIT FOR ZF 16S181 Z=14

    Key Features

    • Gearbox compatibility: ZF 16S181
    • Spline: Z = 14 (14‑tooth)
    • ABER reference: VK4001 family
    • Purpose: intermediate quill drive for rear‑mount PTO
    • Notes: verify length vs 16S151/221 variants before purchase
    Regular price £135.74
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  • ABER QUILL SHAFT ADAPTER KIT ZF 9-S-109/12,91; 16-S-109/13,31
    Regular price £229.34
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    ABER QUILL SHAFT ADAPTER KIT ZF 9-S-109/12,91; 16-S-109/13,31

    Key Features

    • Gearbox compatibility: ZF 9S‑109 (12.91) and 16S‑109 (13.31)
    • Purpose: quill shaft adapter for rear PTO applications
    • Spline details: compatible with ZF 9S/16S‑109 families
    • Cross‑refs: OMFB quill shaft list for 9S/16S‑109 variants
    • Application: connects gearbox jackshaft to PTO unit
    Regular price £229.34
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  • ABER QUILL SHAFT ADAPTER KIT ZF16-AS-2200IT; 12-AS-1800IT;
    Regular price £208.25
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    ABER QUILL SHAFT ADAPTER KIT ZF16-AS-2200IT; 12-AS-1800IT;

    Key Features

    • Gearbox compatibility: ZF 16‑AS‑2200 IT & 12‑AS‑1800 IT (with Intarder)
    • Purpose: intermediate quill shaft between gearbox and rear PTO
    • Benefit: correct torque transfer and shaft alignment
    • Use with: ABER PTOs specified for IT variants
    • Installation: rear mount near transmission output flange
    Regular price £208.25
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  • M5 x 110 CAP head bolt
    Regular price £2.22
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    M5 x 110 CAP head bolt

    Key Features

    • Thread: metric M5
    • Length: 110 mm
    • Head: socket cap
    • Material: high tensile steel (typical)
    • Use: hydraulic assemblies; brackets; adapters
    • Drive: internal hex for controlled tightening
    Regular price £2.22
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  • Normall closed prop. flow control in 2 port 3/8" body -24VDC - Approved Hydraulics Limited
    Regular price £205.26
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    Normall closed prop. flow control in 2 port 3/8" body -24VDC

    Key Features

    • Function: normally closed proportional flow control
    • Porting options: 2 way restrictive ; 3 way priority versions
    • Pressure rating: 240 bar ; 260 bar ; 350 bar depending on model
    • Nominal flow ranges: 40 l.min ; 57 l.min ; 65 l.min ; 114 l.min options
    • Control: PWM current driven solenoid with dither for linearity
    • Coil voltages: 12 vdc ; 24 vdc
    • Connections: DIN 43650 ; Deutsch ; AMP coil connectors
    • Mounting: screw in cartridge for common cavities 10W ; 12W ; 17A families
    • Typical use: speed control of motors or actuators with pressure compensation
    Regular price £205.26
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  • ABER QUILL SHAFT ADAPTER KIT FOR ZF 12AS-1420TD/TO
    Regular price £259.46
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    ABER QUILL SHAFT ADAPTER KIT FOR ZF 12AS-1420TD/TO

    Key Features

    • Gearbox compatibility: ZF 12AS‑1420 TD/TO (AS‑Tronic)
    • Purpose: quill shaft adapter for rear PTO drive
    • Construction: spline‑to‑spline intermediate shaft with bearing support
    • Application: rear PTO installations on mid‑range trucks
    • Cross‑reference: OMFB 09301000020 (equivalent family)
    Regular price £259.46
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  • ABER QUILL SHAFT ADAPTER KIT FOR ZF16-AS-2200; 12-AS-1800; W/- W/O IT
    Regular price £225.17
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    ABER QUILL SHAFT ADAPTER KIT FOR ZF16-AS-2200; 12-AS-1800; W/- W/O IT

    Key Features

    • Gearbox compatibility: ZF 12‑AS‑1800 and 16‑AS‑2200
    • Variants: for gearboxes with or without Intarder (IT)
    • Purpose: intermediate drive between gearbox jackshaft and PTO
    • Benefit: ensures correct spline engagement and alignment
    • ABER references: VK40xx family matched to ABER PTOs
    Regular price £225.17
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  • ABER QUILL SHAFT ADAPTER KIT VOLVO R1700
    Regular price £164.08
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    ABER QUILL SHAFT ADAPTER KIT VOLVO R1700

    Key Features

    • Gearbox compatibility: Volvo R1700 family
    • ABER reference: VK5004 quill shaft kit
    • Approx length: L ≈ 256–261 mm (VK5004)
    • Purpose: connects gearbox output to rear‑mount PTO
    • Application: heavy‑duty truck drivetrains (Volvo SR‑VT)
    Regular price £164.08
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  • QUILL SHAFT ADAPTOR KIT FOR MERCEDES; G230-16/G330-12; NO AQUATARDER
    Regular price £314.72
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    QUILL SHAFT ADAPTOR KIT FOR MERCEDES; G230-16/G330-12; NO AQUATARDER

    Key Features

    • Gearbox compatibility: Mercedes G230-16 and G330-12 (no retarder)
    • Purpose: intermediate quill drive between gearbox and rear PTO
    • Use with: ABER PTOs for these gearboxes (see ABER Mercedes PTO matrix)
    • Mounting position: rear of gearbox (jackshaft area)
    • Notes: version for gearboxes without Aquatarder/Intarder
    Regular price £314.72
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  • Euro Plug 2 Pin To Uk 3 Pin Plug Adapter
    Regular price £9.96
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    • Delivery to UK & Ireland

    Euro Plug 2 Pin To Uk 3 Pin Plug Adapter

    Key Features

    • Input plug types: CEE 7/16 Europlug 2 pin ; CEE 7/7 Schuko E.F depending on model
    • Output socket: BS 1363 Type G 3 pin
    • Rating: 13 A 250 Vac
    • Fuse: 13 A BS 1362
    • Standard: BS 8546.2016+A1.2018 travel adaptor specification
    • Safety features: shuttered outlets ; insulated construction
    • Function: adapter only ; no voltage conversion
    • Typical use: power EU equipment from UK mains 230 Vac
    Regular price £9.96
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  • ADMISSION CONNECTOR 1"1/2 PIPE 2" ELBOW 45º
    Regular price £39.71
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    ADMISSION CONNECTOR 1"1/2 PIPE 2" ELBOW 45º

    Key Features

    • Connections: 1 1/2" pipe to 2" elbow
    • Elbow angle: 45°
    • Intended use: pump admission / suction line
    • Design: swept elbow to minimise pressure loss
    • Category: ABER pump spares / suction fittings
    Regular price £39.71
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  • placeholder
    Regular price £122.53
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    Cetop 3 E Spool All Ports Blocked 110VAC Coils

    Key Features

    • Valve type: CETOP 3 directional control valve
    • Spool: E spool with all ports blocked in center position
    • Coils: 110 VAC solenoids
    • Mounting pattern: NG6 / ISO 4401-03
    • Function: holds load at center; blocks P; A; B; T
    • Use: industrial hydraulic manifolds and presses
    Regular price £122.53
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  • M18 Dowty Washer - Approved Hydraulics Limited
    Regular price £0.82
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    M18 Dowty Washer

    Key Features

    • Size: M18 metric bonded seal
    • Dimensions: ID 18.7 mm ; OD 26.0 mm ; thickness 1.5 mm
    • Materials: steel ring ; NBR elastomer
    • Alternatives: stainless ring ; FKM ; EPDM options
    • Pressure capability: up to 250 bar standard
    • Temperature range: -30 to +200 degC depending on elastomer
    • Surface finish for sealing: Rmax <= 15 um ; Ra <= 3.2 um recommended
    • Applications: static sealing under bolt heads ; threaded stud ends in hydraulic ports
    Regular price £0.82
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    • Delivery to UK & Ireland
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £35.34
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    1 1/" BSP Male - 1 1/2" BSP Male Adaptor

    Key Features

    • Type: inline adaptor male to male
    • Threads: 1 1/4 BSP to 1 1/2 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or extend fittings
    Regular price £35.34
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    • Order by 3pm for Next Day Delivery
  • 3/8" Dual Cross Line Relief Valve (V0440/180) 35 lpm - 100-180 Bar - With Protection Caps
    Regular price £72.67
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    3/8" Dual Cross Line Relief Valve (V0440/180) 35 lpm - 100-180 Bar - With Protection Caps

    Key Features

    • Thread size: G 3/8 BSPP
    • Setting range: 10 to 180 bar adjustable
    • Max flow: 35 l.min ; 45 l.min variants
    • Max pressure: 350 bar
    • Construction: zinc plated steel body ; hardened internal parts
    • Seals: NBR Buna N standard
    • Function: dual cross line relief with crossed tank
    • Typical use: motor or cylinder shock protection with independent port settings
    Regular price £72.67
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  • ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings - Approved Hydraulics Limited
    Regular price £101.12
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    ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings

    Key Features

    • Mounting interfaces: PTO EN.ISO 4 bolt to UNI 3 bolt
    • Integrated bearing: one ball bearing
    • Max torque: 315 N.m
    • Max power at 1000 rpm: 33 kW
    • Use case: fit UNI 3 bolt pumps to ISO 4 bolt PTO housings
    • Construction: steel adaptor with precision machining
    • Accessories: studs ; gaskets available in kits
    Regular price £101.12
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  • BYPASS VALVE TO WORK IN PUMPS FROM 17cc/rot TO 60cc/rot; 24 VDC
    Regular price £477.13
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    BYPASS VALVE TO WORK IN PUMPS FROM 17cc/rot TO 60cc/rot; 24 VDC

    Key Features

    • Compatibility: pump sizes 17–60 cc/rev
    • Coil: 24 VDC solenoid (12 V on request)
    • Max pressure: up to 350 bar family rating
    • Function: unloads pump by bypassing pressure to inlet
    • Variants: versions with integrated relief valve available
    • Mounting: bolts to pump end‑cap (symmetrical orientation)
    Regular price £477.13
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £6.78
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    1/2 BSP Male x 5/8 BSP Male Adaptor

    Key Features

    • Type: inline adaptor male to male
    • Threads: 1/2 BSP to 5/8 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or extend fittings
    Regular price £6.78
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

Google Shopping for Professional Hydraulic Applications

Discover quality google shopping 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.