Premier 370PK Service Manuallines

BEFORE GETTING STARTED:
► This procedure should only be performed by a qualified
mechanic.
► Measure the wear on the coupling's pintle hook. If the
wear is at or exceeds 20% of the cross section, the
coupling is considered Out of Service. Do Not continue.
Premier has Wear Gages to determine wear on our
Couplings and Drawbar Eyes.
► Examine the entire coupling body for excessive wear or
any damage. If any exists, do Not continue, coupling
needs to be replaced.
► Tools required: 1 1/16" & 15/16" sockets, and a flat head
screw driver.
► Safety glasses are required for all of the following
procedures.
► See attached Image Reference Section(s) with photos
and/or drawings to identify various parts.
► Prior to disassembly, familiarize yourself with the location
of all the various parts in the coupling. This will assist in
the assembly process.
DISASSEMBLY
1) The coupling body should be positioned upright with the
latch in the closed position (see Image #2 in the Image
Reference Section.)
2) Locate the 374 Bolt, which resides within the 472 Latch,
and remove the 274A Locknut from the left side. Slide the
374 Bolt out from the right side. Remove the 472 Latch.
3) With the 582A Spring still spring-loaded on the 372B
Locking Pawl, cautiously remove the locking pawl, since
the spring may eject during removal.
4) Remove the 582A Spring.
5) Locate the 375 Bolt, which resides within the 373 Pawl,
and remove the 375A Locknut from the left side. Slide the
375 Bolt out from the right side.
**Do not discard it, you will need to use this 375 Bolt again
for reassembly purposes.
premier manufacturing company
THE FIRST NAME IN QUALITY COUPLINGS
370PK SERVICE GUIDELINES
For coupling models: 370, 370B, 570 & 770
6) Remove the 373 Pawl, 373A Spring and **373B Spacer
(**for 570 models and older model 370's, 370B's & 770's
only). There will either be a **removable spacer (see
Image #1, 373B Spacer) OR a built-in spacer on the
inside right 375 Bolt body hole (see Image #4).
7) IF you are replacing the shoe and its components (279,
379 or 579) then determine your coupling model number
and follow instructions for either A, B or C below:
Otherwise, continue on to #8.
A) FOR MODELS 370 & 770 (using 279 Shoe):
Locate the 274 Bolt, which resides within the 279
Shoe at the bottom of the coupling and remove the
274A Locknut from the left side. Slide the 274 Bolt out
from the right side and remove the 279 Shoe and 266
Spring.
B) FOR MODEL 370B ONLY (using 379 Shoe):
Position the coupling so that you are looking at the
lower back side (see Image #5). Locate the straight
leg of the 376 Spring on the left hand side and push
it to the right, until it has moved past the internal shoe
stop. You may need to push the shoe forward to
allow for clearance of the spring. Turn the coupling
back around to face the front of it. Locate the 374
Bolt residing in the 379 Shoe and remove the 274A
Locknut from the left side. Slide the 374 Bolt out from
the right side then remove the 579 Shoe and 376
Spring from the top of the coupling opening.
C) FOR MODEL 570 ONLY (using 579 Shoe):
Position the coupling so that you are looking at the
lower back side (see Image #5). Locate the straight
leg of the 376 Spring on the left hand side and push
it to the right, until it has moved past the internal shoe
stop. You may need to push the shoe forward to
allow for clearance of the spring. Turn the coupling
back around to face the front of it. Locate the 374
Bolt residing in the 379 Shoe and remove the 274A
Locknut from the left side. Slide the 374 Bolt out from
the right side then remove the 579 Shoe and 376
Spring from the top of the coupling opening.
8) With all parts removed from the coupling body, clean and
Page 1
1-800-255-5387 • www.premier-mfg.com
370
Coupling