SECTION IV
MAINTENANCE / SERVICE
(5) Remove large plug (1, Figure 4-11) from mani-
fold (2).
(6) If removing pilot operated check valve which
affects input to base of Trendelenburg cylinder,
remove small plug (A) from manifold (2); then
proceed to step 8.
(7) If removing pilot operated check valve which
affects input to rod end of Trendelenburg
cylinder, perform the following steps before
proceeding to step 8:
a. Remove fitting connector (B), fitting seal (C),
and disconnect tube (D) from upper mani-
fold (E).
b. Disconnect tube (D) from male con-
nector (F).
CAUTION
There is an orifice in male connector (F).
Do not lose orifice or table speed will be
affected.
c. Remove male connector (F) from mani-
fold (2).
(8) Using a long, thin needle nosed pliers, unscrew
guide shaft (3) and remove spring (4), washer
(5), nylon washer (6), and check valve (7) from
manifold (2).
(9) Using a small punch or Allen wrench, push pilot
piston (8) out of manifold (2).
(10) Remove spring (9) from manifold (2).
B. Installation
(1) Clean all metal components with degreasing
solution and allow to air dry. Flush out manifold
(2, Figure 4-11) using clean oil.
(2) Install nylon washer (6) and washer (5) on check
valve (7).
(3) Install assembled check valve (7) and spring (4)
in manifold (2) and secure with guide shaft (3).
CAUTION
Make sure guide shaft bottoms out.
Failure to do so will result in improper
functioning of check valve. However, do not use
excessive force on guide shaft to prevent damaging
components.
(4) Using a long, thin needle nosed pliers, screw
guide shaft (3) inward until it bottoms out in
manifold (2); then unscrew guide shaft two full
turns.
(5) Install spring (9) and pilot piston (8) in mani-
fold (2).
(6) Using a punch or Allen wrench, push on pilot
piston (8) to ensure that it moves freely (ap-
proximately 1/8 in. (3.2 mm) travel).
(7) If installing pilot operated check valve which
affects input to base of Trendelenburg cylinder,
coat o-ring of small plug (A) with oil; then install
small plug in manifold (2). Then, go to step 9.
Page 4-12Printed in U.S.A.
Figure 4-11. Trendelenburg Pilot Operated
Check Valve Removal / Installation
CA7628
1
2
8
9
8
9
A
F
D
B
C
E
3
4
5
6
7
3
4
5
6
7
1
BASE INPUT PILOT
OPERATED CHECK VALVE
ROD END
INPUT PILOT
OPERATED
CHECK VALVE
© Schaerer Mayfield USA, Inc. 2004
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