Repair Kits Available By Part Number Section 2 Page - GAMECO

WARNING: Installation, disassembly, repair and maintenance
must be performed only by qualified personnel.
Maintenance on the 7188 master cylinder should be performed
after gas is safely evacuated from the connected 7177 control
valve. See caution below.
Installation, usage and maintenance of this product must be in
compliance with all Engineered Controls International, Inc. instructions
as well as requirements and provisions of NFPA #54, NFPA
#58, DOT, ANSI, all applicable federal, state, provincial and local
standards, codes, regulations and laws.
Inspection and maintenance on a periodic basis is essential.
Be sure all instructions are read and understood before installation,
operation and maintenance. These instructions must be
passed along to the end user of the product.
CAUTION: Contact or inhalation of liquid propane, ammonia and
their vapors can cause serious injury or death! NH3 and LP-Gas
must be released outdoors in air currents that will insure dispersion
to prevent exposure to people and livestock. LP-Gas must be kept
far enough from any open flame or other source of ignition to
prevent fire or explosion! LP-Gas is heavier than air and will not
disperse or evaporate rapidly if released in still air.
A. To Replace 7188-4 O-Ring on 7188-2 Piston
NOTE: Special tool required for steps 3,4,8 and 10. See figure A.
1. Place a small receptacle under cylinder to collect hydraulic fluid,
then remove 7188 master cylinder from bracket on scale pillar cap.
2. Remove 7188-10 roll pin that loosely secures 7188-6 trip latch to
7188-9 lever.
3. Remove 7188-8 retainer, using special tool fabricated by customer
(see figure A). Also, remove 7188-6 trip latch and 7188-7 spring
from spring bore in 7188-1 body.
4. Remove 7188-3 guide bushing from threaded bore in body, using
tool shown in Figure A. This should allow piston to be removed
from piston bore without difficulty. If binding is experienced in
removing piston from bore, thread any convenient 1 /4"-20 screw or
bolt into mating thread located in rounded boss on front of piston.
This provides an additional extension grip to facilitate removal of
piston.
5. Remove 7188-4 o-ring from piston, being careful not to scratch o-
ring groove or large piston diameter in area of groove.
6. Replace with new o-ring, making sure o-ring and groove have been
lubricated with hydraulic fluid from system. Use caution in spreading
o-ring over large piston diameter so as not to damage o-ring.
7. After making sure that piston bore of 7188-1 body is free from
foreign matter, partially fill with hydraulic fluid, then reassemble
piston into body.
8. Using tool shown in Figure A, tighten 7188-3 guide bushing into
threaded bore until it bottoms on tapered shoulder in body. Align
one of the four holes in the guide bushing with the spring bore in
which the trip latch is normally located. If necessary, back off guide
.0487 Ref.
1
/16"
5
/8"
7
/16" R.
3
/16"
*7188-6 Trip Latch
7188-1 Body
20-22 Ball
7188-11 Lever
7-196 Adjusting Screw Locknut
7188-15 Set Screw
7188-18
Adjusting Plunger
2 7 /8"
1
/8"
1
/32" R.
1
/16" R.
21
/64"
1
/2"
3
/8" R.
1 1 /4"
3
/8" R.
1
/2"
Before Forming
Figure A
Special tool must be fabricated by customer.
Material: 18GA (.0478) Stainless Steel
7188-16 Screw
7188-3 Guide Bushing
7188-13 Adjusting Screw
7505-3 Jam Nut
7188-14 Screw
Trip Arm
7194F-2 for Fairbanks
Morse Scale
7194H-2 for
House Scale X
7188-9 Lever 7188-8 Retainer
Figure B
* Components of 7188-50 Repair Kit.
X
X
7188 Master Cylinder
X
X
7188-17 Bonnet
*7188-4 O-Rings
7188-5 Spring
*7188-2 Piston
*7188-7 Spring
7188-10 Roll Pins
Oil occasionally with general purpose
lubricating oil in reassembling.