8
Section VI – Overhaul
A. Unit Removal
CAUTION
Before breaking a circuit connection, make certain
that power is off and system pressure has been
released. Lower all vertical cylinders, discharge
accumulators, and block any load whose movement
could generate pressure.
1. Remove relief valve from system.
2. Drain appropriate hydraulic lines and remove the
valve from system.
3. Cap all system openings to prevent contamination.
4. Place the relief valve on a clean work bench.
CAUTION
Absolute cleanliness is essential when working on a
hydraulic system. Always work in a clean area. The
presence of dirt and foreign materials in the system
can result in serious damage or inadequate
operation.
B. Service Tools
The following tools are recommended to overhaul a CG, CS,
CT, or C*5 relief valve:
Standard Tools and Equipment:
1. A 6 inch crescent wrench.
2. One set of hex key wrenches with a socket adaptor.
3. Petroleum jelly or grease that is compatible with
hydraulic fluids.
4. Cleaning solvent.
5. A small ball peen hammer.
6. One medium size screwdriver.
7. One torque wrench (0-250 lb. in.)
8. A clean work bench that is equipped with a vise.
9. Shop air (90 psi).
Special Tools:
1. A piece of drill rod or roll steel to remove the seat
within the valve body. See Figure 3.
Figure 3. Disassembly Tool to Remove
Seat (19) from Body (21)
Flat Surface
4”
Deburr Rod Edges
(4 places)
See table for
Rod Diameter
Model Rod Diameter
CS-03
CT/CS-(H)06
CT/CS-(H)10
3/4 inch (19.05 mm)
3/4 inch (19.05 mm)
1 inch (25.4 mm)
Roll Steel or Drill Rod
2. One screw (approximately 4 inches long), two
washers, and one nut. This particular tool is needed to
remove the seat and/or sleeve from the body of CG
(subplate mounted) models only. See Figure 4.
Figure 4. Seat (19) Removal Tool (CG Models)
Washer
Washer
Nut
Model Rod Diameter
CG-03/06
CG-10
3/8 inch (9.52 mm)
5/8 inch (15.87 mm)
Screw Length
4 inch (101.6 mm)
4 inch (101.6 mm)
Seat
Screw
(see table)
Turn screw clock-
wise to remove seat
Tank Port
CG
Body
C. Disassembly
Periodic maintenance of the relief valve will generally not
require disassembly to the extent described here. However,
the following disassembly sequence can be used as a guide
for partial disassembly. In general, disassembly is accom-
plished by item number sequence shown in Figure 5.
1.Thoroughly clean the valve exterior with cleaning
solvent.
2. Secure valve body (21) in a vise.
3. Loosen lock nut (2).
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