4
©2022 Harford
Attachments Ltd
PROLOK/G
EN/MAN/R4
Introduction
Thank you for purchasing the
Harford Pro-Lok
quick hitch for excavators. The
information contained in this manual should be read carefully and understood by all
operators of the quick hitch, to ensure optimum performance of the product.
The
Harford
Pro-Lok
is designed to pick up standard attachments for excavators,
made to OEM specification. The adjustable sliding wedge plate provides a locking
device, which is free from movement. This minimises any wear over the lifetime of the
hitch.
There are several unique safety features are built-in to the
Pro-Lok.
The combination
of which results in a safe, tough and durable product. Regular maintenance of the hitch
will give you many hours of reliable, trouble-free operation.
It is important that the installation is carried out by a competent person, preferably
someone with experience of quick hitch operation.
The operation and maintenance instructions should be followed carefully to ensure safe
and correct use of the quick hitch. Failure to do so could cause injury and/or invalidate
the product warranty.
IMPORTANT:
All
Harford Pro-Lok
hitches are CE certified, having undergone a thorough
evaluation process by Harford Attachments. Any subsequent modification to the
hitch will invalidate this certification and the product warranty.
Safety Features
There are several unique safety features incorporated into the
Harford
Pro-Lok
quick
hitch. The features combine to prevent attachments becoming unintentionally
disengaged from the quick hitch.
1. The wedge plate is tightened the same way as a bolt, i.e., in a clockwise direction.
2. A patented anti-unwind feature is built into the threaded actuator. This can easily
be adjusted to ensure firm rotation during maintenance.
3. The geometry of the wedge plate and quick hitch locking surface creates a locking
mechanism in its own right. The clamping force of the wedge surface is up to 4.5
times the force applied by the threaded actuator. This feature creates a secure and
safe locking device.
4. A sprung loaded front lock ensures that the front pin is secure when connecting an
attachment and during operation. This is visible to the operator from the cab.
5. A rear lock indicator allows the operator to check that the rear locking wedge is in
its correct operating position. This is also visible from the cab.
