Section 3
3 - 13
Brake Valve Pressure Check and Adjustment
All installations with optional
DRAG-BRAKE
Test Equipment:
•
(1) 1,000 psi (6,895 kPa) Gauge
•
(1) 5,000 psi (34,474 kPa) Gauge
Connect pressure gauges to:
•
RI (Tee into existing line)
•
BR (Tee into existing line)
Instructions
1. Use tees and fi ttings as available to connect 1000 psi
pressure gauges at both the
RI
and
BR
ports on the
control manifold.
NOTICE
Even though the pressure required for
brake release at RI is low, the actual
pressure sent to that port could be full
supply pressure. Use a 5,000 psi gauge.
2. Start dozer and set to high-free idle.
3. Slowly meter the control lever into the
LINE-IN
position while monitoring both gauges.
4. BR
pressure will jump to full pilot supply pressure
when
RI
reaches the pilot setting of the brake valve.
Table 3-8 Hydraulic Pressure Readings
Dozer
Pressure in
PSI [kPa]
RI
BRAKE RELEASE
PRESSURE
TP-BRAKE
PILOT
PRESSURE
TigerCat
920 (Y46F)
80-100
[552-689]
350 - 400
[2,413 - 2,758]
5. Check pressure as indicated in Table 3-8. The brake
valve sets the overlap between the hydraulic motor
drive and brake release.
6. A low setting on the brake release valve will release
the brake before the motor begins driving. A high
setting on the brake release valve will momentarily
drive the motor against the brake before the brake
releases.
Brake Valve Adjustment
1. Slowly meter the control lever into the
LINE-IN
position.
2. Measure pressure at
BR
and
RI
pressure test ports.
3. Loosen brake valve locknut. Turn adjusting capscrew
OUT to decrease pressure and IN to increase
pressure. Adjust pressures as shown in Table 3-8.
NOTICE
The values in Table 3-8 are based on
information available at time of publishing.
Refer to the service/maintenance manual
supplied with your dozer to verify the
available pilot pressure.
Figure 3-14 Test Equipment Setup
1000 PSI Gauge
at BR Port
5000 PSI Gauge
at RI Port
Brake Valve
Summary of Contents for H5C Series
Page 8: ...vi Notes...
Page 48: ...General 1 40 Notes...
Page 59: ...Troubleshooting 2 6 Notes...
Page 77: ...Service 3 18 Notes...
Page 86: ...Section 4 4 9 Intentionally Blank...
Page 104: ...Section 4 4 27 Intentionally Blank...
Page 108: ......
