Question 1

How does the Pro-Lok double-locking system improve safety?

Accepted Answer

Pro-Lok features a unique double-locking technology with two independent locking mechanisms that must both engage for the attachment to be secured. This eliminates the need for a traditional safety pin while exceeding HSE safety standards. The spring-free design removes the most common failure point in quick hitches.

Question 2

What tonnage ranges are available for the Pro-Lok?

Accepted Answer

Pro-Lok quick hitches are available for all machines from 0.75 to 8 tonnes, covering everything from mini excavators to medium-sized machines. Each tonnage class is specifically engineered with the appropriate ratchet mechanism and locking force for its weight range.

Question 3

Is Pro-Lok compatible with my excavator brand?

Accepted Answer

Yes, Pro-Lok is compatible with all major excavator brands including JCB, Kubota, Caterpillar, Komatsu, Hitachi, Volvo, Takeuchi, Doosan, and many more. It can be fitted to most excavators in the supported tonnage range and works with standard pin centers.

Question 4

What maintenance is required for the Pro-Lok?

Accepted Answer

Pro-Lok requires minimal maintenance - just regular greasing and visual inspection. The spring-free design eliminates spring replacement, and the robust ratchet mechanism is built for long service life. Harford's trademark wedge system provides automatic wear compensation.

Question 5

What warranty is included with Pro-Lok?

Accepted Answer

Pro-Lok comes with a comprehensive 2-year warranty from the date of purchase. Extended warranty options are available, and we provide full technical support and spare parts throughout the UK. The British-made quality ensures exceptional reliability.

Question 6

How long does Pro-Lok installation take?

Accepted Answer

Pro-Lok fits to your machine in minutes. The rapid installation process requires no special tools or modifications to your excavator. Operation manuals and video tutorials are available to guide operators through the simple ratchet mechanism.

Question 7

What makes Pro-Lok different from spring-type quick hitches?

Accepted Answer

Pro-Lok's double-locking technology outperforms spring-locking hitches by eliminating spring failure - the most common problem in traditional designs. The ratchet mechanism provides consistent locking force, requires no safety pin, and offers many times the service life of spring-type couplers.

Question 8

Can Pro-Lok be retrofitted to older machines?

Accepted Answer

Yes, Pro-Lok can be retrofitted to most excavators within the supported tonnage range. Our technical team can advise on compatibility with specific older models and provide custom pin centers if required for your machine.

Pro-Lok® Double Locking Quick Hitch

Revolutionary Features

Available Tonnage Classes

Technical Specifications & Features

Technical Specifications

Physical Specifications

Performance Specifications

Frequently Asked Questions

Pro-Lok Video

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