Komatsu 830E Shop Manual page 349

FIGURE 3-6. VALVE BODY SEAL INSTALLATION
1. Actuator Plunger
2. Valve Body
3. Poly - Pak Seal
Valve Body Seal Installation
1. Install the poly-pak seal (3, Figure 3-6) in the seal
groove first. Position the seal in the groove so that
the internal O-ring inside the poly-pak seal is
facing down toward the bottom of the valve.
2. Make sure the internal O-ring is still seated inside
the poly-pak seal (3) and did not get dislodged
during installation. Position the poly-pak seal to
the bottom of the groove.
3. Install the orange back-up ring (4) on top of the
poly-pak seal. Start by hand and then continue to
work into the groove either by hand or by using
an O-ring installation tool.
4. Install the wiper seal (5) in the top counterbore.
Position the seal in the groove so that the register
lip is facing up toward the actuator.
5. Repeat Steps 1- 4 for the second bore.
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4. Back-Up Ring
5. Wiper Seal
6. Actuator Base
Brake Circuit Component Service
FIGURE 3-7. SLEEVE SEAL PLACEMENT
1. Back-Up Ring
2. O-Ring
3. Regulator Sleeve
Regulator Sleeve O-Ring Installation
1. Install an O-ring (2, Figure 3-7) onto the smallest
groove (on the top) of the regulator sleeve (3).
Install O-ring (5) onto the middle groove on the
regulator sleeve. Install O-ring (6) onto the largest
groove (on the bottom) on the regulator sleeve.
2. Install a split nylon back-up ring (4) onto each side
of the O-ring (5) located in the middle of the
regulator sleeve.
3. Install one split nylon back-up ring behind the
O-ring (2) located at the top end of the sleeve.
This O-ring is the smallest of the three O-rings.
Position the back-up ring so that it is next to the
top of the regulator sleeve. The top of the sleeve
is the end with the smallest O.D.
4. Repeat Steps 1-3 for the second regulator sleeve.
Actuator Plunger O-ring Installation
1. Install an O-ring (7, Figure 3-5) into the O-ring
groove located at the large diameter end of the
actuation plunger (3).
2. Install a split Glyde ring over the O-ring. (Twist and
squeeze the split Glyde ring into a small circle
before installing to insure a tight fit over the O-
ring).
3. Repeat Steps 1 & 2 for the second plunger.
4. Back-Up Ring
5. O-Ring
6. O-Ring
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