Upright X27-33RT, Service & Parts Manual

Page: 21 / 134

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Servicing STC Fittings
These units use Aeroquip STC hydraulic
fittings. Please read the following service
i n f o r m a t i o n b e f o r e u n d e r t a k i n g a n y
disassembly or service work on these
fittings.
Figure 1. - STC Components
NOTE:
An STC release tool kit is available from Snorkel,
Part Number 12791K
❑
Disconnection
Remove pressure from the system before
attempting to disconnect these fittings in
order to avoid forceful ejection of the fitting,
which could result in personal injury.
1. Some fluid may still be in the system.
Minimise fluid loss by draining the fluid from
the system components prior to
disconnection.
2. Prior to disconnection, clean the area around
the fitting with a clean cloth, or, using an
airgun blow dirt and debris from the release
sleeve area.
3. To help avoid release sleeve tearing create a
release tool insertion gap by moving the
sleeve in the release direction. (see Figure
2). This can be done either by hand or by
using a single prong of the release tool.
4. Insert the release tool behind the release
sleeve D (see Figure 1) and pull the hose
assembly out from the mating STC connector
(leaving the release tool inserted will aid
disassembly).
Do not pry on the fitting with
the release tool. (See Figure 2).
5. If a release tool is not available, a thin blade
screwdriver may be used (larger fitting sizes
may require two screwdrivers). Follow step 4
above.
Use with care - a screwdriver could damage
the release sleeve.
❑
Inspection
1. STC Fittings are designed to be connected
and disconnected repeatedly without
replacing the O-Ring and Back-Up-Ring,
unless leakage or damage is observed.
2. Inspect mating STC fittings to ensure they
are in good condition, clean and free of
contaminants, nicks, scratches, flatspots etc.
3. Check the Wire Latch Ring
C (see Figures 1
and 3) to ensure that it is in the proper
position in the female STC connector prior to
installation or reconnection.
4. Check the O-Ring A to ensure it is not cut or
otherwise damaged prior to installation or
reconnection.
5. Check the Back-Up-Ring B to ensure it is
not damaged. Verify that it is at the front of
the O-Ring groove prior to reconnecting the
fitting.
Figure 2. - STC Assembly
If leakage is observed, and the fittings are in
o t h e r w i s e g o o d c o n d i t i o n , a s e a l
replacement kit must be installed or the
fitting must be replaced!
If seals are not replaced, a decrease in
system performance or damage to the
system components may result.
❑
Installation and connection
1. Install the STC port connector into the
mating port carefully. Follow recommended
installation procedures for the applicable port
fittings.
SR3370 & SR2770 – 13184B Rev D page 17
Maintenance Information
IMPORTANT
DANGER
CAUTION
A
Female Port Connector
Female Components
Male Hose Fitting
B
C
D
A. - O-Ring
B. - Back-Up Ring
C. - Wire Latch Ring
Male Components
D. - Release Sleeve
Composite Release Sleeve
Insert Release Tool or
Screwdriver Here;
Sleeve Should Move
To The left
Release
Direction