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©2022 Harford Attachments Ltd
SAFELOCK/GEN/MAN/R5
Figure 6: Typical thread actuator assembly
Important Maintenance Information
Adjusting the Threaded Actuator
The rotational resistance of the threaded actuator must be firm at all times but can be easily adjusted
using standard tools. This safety feature further enhances the positive locking mechanism built into
the
Harford Pro-Lok
hitch.
1. Disconnect the attachment from the
Harford
Pro-Lok
.
2. Remove the wedge plate from the
Pro-Lok
by rotating the threaded actuator in a clockwise
direction until the two parts disconnect.
3. Remove the two bolts, retaining the
protective shroud over the threaded actuator. Slide the
shroud off the threaded shaft and remove completely.
4. Using an Allen key, loosen the cap screws in the split nut.
5. Place the ratchet spanner in the square drive and rotate the split nut anti-clockwise (L.H. thread)
until it tightens up firmly against the thrust washers.
6. Clamp the split nut against the threaded shaft by tightening up the cap screws.
7. Check the tightness of the threaded actuator. It should only be possible to rotate the actuator
with the ratchet spanner, not by hand.
8. Re-assemble and grease, see Routine Maintenance Information on page 8, steps 3 and 4.
WARNING:
Ensure wedge plate is fully retracted before greasing.
ITEM
DESCRIPTION
1
L.H. Thread
2
2 x DU Washer
3
DU Bush
4
2 x Hex. Head Bolt
5
Front Plate
6
2 x Cap Screw
7
L.H. Split Nut
8
Shroud
9
2 x Grease Nipple
10
Shroud Seal
11
2 x Spring Washer
12
2 x Hex. Nut
13
Pan Head Screw
14
Red Sleeve
15
Wedge Assembly
