Buyers P45AC4 User Manual

Quality since 1946

Rebuild Instructions

P45AC4

Air Compensated Pintle Hook

Use with replacement part kits: C4200, C4300, & C4400

9049 Tyler Blvd. • Mentor, Ohio 44060

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ITEM NO. PART NO. DESCRIPTI ON C4200 C4300 C4400

1 - Body Casting - - ­ 2 C4002 Plunger 1 - 1
3 C6003 Lock - 1 1
4 C6004 Jaw 1 - 1
5 C6005 Shaft 1 - 1
6 C6006 Torsion Spring 1 1 1
7 C6008 Actuator - - 1
8 C6009 Set Screw - 1 1
9 C6010 Roll Pin 1 1 1
10 C6011 Retaining (Snap) Ring 1 - 1
11 C6012 Grooved Pin (Rivet) 1 - 1

B. Pivot Shaft Inspection

1. Verify that the Shaft (5), Snap Ring (10), and

Grooved Pin Rivet (11) are in place and secure. See
Fig. 1 on page 2 for proper location for Snap Ring.

C. Jaw Inspection

1. Place a properly matched lunette eye on the

INSPECTION

A. Body Inspection

1. Visually inspect the pintle hook Body Casting

(1) for signs of excessive wear, or fatigue such as
deformation or cracks. If any such conditions are
noted, the entire hook should be replaced. (This is
a good time to check the mounting structure, bolts,
and air chamber. Contact vehicle manufacturer for
guidelines.)

hook, lower the Jaw (4) and apply operating pres­sure to the air chamber.

2. With the Lock disengaged, as shown in Fig. 2 on
page 2, lift the Jaw (4) until it stops. The second-

ary interlock feature must prevent the Jaw from
opening more that 1/2” above the horn.

3. If the space exceeds 1/2”, replace the Jaw and
Plunger using replacement Jaw Kit C4200 of the
Rebuild Kit C4400.

–continued

Quality since 1946

Fig. 1

D. Lock Inspection

1. Grasp the Lock Actuator (7) and without com-

pressing the Spring (6) rotate the Actuator handle
to lift the Lock (3) until it stops against the Body
undercut (A). The “tooth” if the Lock must not
clear the stop (B) on top of the Jaw (4). If the lock
clears the stop (B) as shown in Fig. 3.
a. Inspect the undercut (A) on the Body, if the
undercut is not clean and square the entire hook
should be replaced.
b. If the under cut is in good condition, then install
a new Lock Kit C4300 or Rebuild Kit C4400.

E. Full Rebuild

If inspection steps A-D indicate that both the Lock
and Jaw mechanisms require replacement, then
the Rebuild Kit C4400 should be used.

JAW KIT C4200

A. Disassembly

1. Remove the Roll Pin (9) from the Actuator (7),

loosen the Set Screw (8) and pull the Actuator (7)
out of the assembly. This will release the Lock (3)
and the Torsion Spring (6) from the assembly.

2. To remove the Shaft (5) which secures the Jaw
(4), remove the head of the Rivet (11) using a cold
chisel or by grinding (eye protection is required.)
Then remove the Retaining Ring (10) with the
proper snap ring tool. Complete the disassembly
by inserting a pin through the rivet hole in the
Body and driving out the old Shaft.

2

Fig. 2

Fig. 3

Quality since 1946

3. Clean and inspect the Body for any damage,
which may not have been detected during initial
inspection.

4. Clean the snap ring groove and verify that it has
not been crushed or broken through. If the snap
ring groove is damaged the entire hook must be
replaced.

B. Jaw Kit Installation

1. Apply a liberal amount of a good grease inside

the shaft hole in the Jaw (4). Place the Jaw into po­sition in the Body and insert the new Shaft (5). Do
not install the Snap Ring at this time.

2. Place a lunette eye of the proper size onto the
hook. With the Jaw resting on the top of the horn,
verify that the Air Chamber will be able to push
the Plunger against the eye.

3. If interference of the Jaw and Plunger will not
allow the Plunger to contact the eye, remove the
Jaw and inspect for any burrs and carefully file
or grind to allow free movement. Care should be
taken not to remove an excessive amount of
material. Reinstall the Jaw and repeat step 2.

4. With the lunette eye in place and the Plunger
held against the eye, verify that the Jaw will not
lift more than 1/2” above the horn as in inspection
step C2.

B. Lock Installation

1. Install the new Torsion Spring (6) onto the

Actuator so that the left end will rest on the shelf
provided in Body and the right end will insert into
the small hole at the back of the Lock.

2. Take note of the location of the flat area on the
Actuator shaft. Insert the Actuator through the
Lock and the right side hole in the Body. Tighten
the Set Screw (8) against the flat area on the Ac-

C. Lock Installation

1. Reassemble the Lock mechanism as described

below in the Lock Kit C4300 section.

tuator.

3. Install the Roll Pin (9) through the hole in the
end of the Actuator.

Plunger Installation

D. Secure the Pivot Shaft

1. Install the Rivet by providing a back stop

against the end of the Shaft on the snap ring side
of the hook and driving the Rivet (11) into the hole
provided in the end of the Shaft (eye protection re­quired.) DO NOT USE THE SNAP RING TO BACK­UP THE RIVETING.

2. Install the Snap Ring (10) and inspect as shown

FULL REBUILD KIT C4400

The Rebuild Kit contains all parts required to
rebuild the P45AC4 Pintle Hook Assembly. The
rebuild procedure is to follow the instructions to:

1. Replace the Jaw and Plunger per Instructions
for Kit C4200; then

2. Replace the Lock per the instructions for
Kit C4300.

in Fig. 1.

LOCK KIT C4300

A. Disassembly

1. Remove the Roll Pin (9) from the Actuator (7),

loosen the Set Screw (8) and pull the Actuator out
of the assembly. This will release the Lock (3) and
the Torsion Spring (6) from the assembly.

2

3003920 Rev. A