©2022 Harford Attachments Ltd
9
PROLOK/GEN/MAN/R4
Fitting the Harford Pro-Lok to your Excavator
SAFETY NOTICE:
It is recommended that safety gloves are worn during the installation of the
quick hitch.
1. Remove any existing attachment from the machine dipper arm and crowd link arm.
The two original pins that are removed from these pivot points must be used to attach
the
Pro-Lok
hitch to the excavator (These pins are usually hardened and
greaseable).
2. Carefully align the dipper arm between the two front bosses on the hitch as shown
in Figure 1. Replace any
‘O’ rings that were removed previously and slide one of
the original pins through the quick hitch and dipper arm. Securely fix the pin in place
by using the original or supplied retention method. Ensure any retention bolts are
tightened using double nuts to lock against each other.
3. Repeat step 2 with the crowd link arm linkage.
4. Grease the two pins and visually check that they are located and secured correctly.
5. Use the excavator hydraulics to carefully rotate the quick hitch to the extremes of
the crowd cylinder (e.g., no stroke and full stroke). Check the clearance of the quick
hitch with any part of the dipper arm and linkage.
6. Fit the supplied yellow
Warning sticker
in the cab in a prominent position. Also
supplied are three
‘Safety Pin Not Required’ stickers
– one to fit in the cab
alongside the yellow
Warning sticker
and one each side of the dipper arm near the
quick hitch.
7. Medium tensile pins (or better) should be used in both pin location holes of the
attachment. Visually check to ensure the pins are correctly fitted and are secure
before the attachment is used. Ensure any retention bolts are tightened using
double nuts to lock against each other.
8. You can now proceed to
‘Connecting an Attachment to your
Pro-Lok
’.
Crowd Cylinder
Idler Link
Crowd Link
Pro-Lok
Original Pins
Dipper Arm
Figure 1
