Terex TR60 Maintenance Manual page 465

AND BRAKE CONTROL TANK. Add oil if low. Use
oils meeting the specifications outlined in Section
300-0020, LUBRICATION SYSTEM.
5. Start engine and bring hydraulic fluid to operating
temperature and apply all brakes in sequence.
6. Check for oil leaks and tighten connections as
necessary.
7. Engage retarder. Make sure of a full service brake
application and that retarder light illuminates. Release
retarder.
8. Check all connections again for leaks and tighten
as necessary.
MAINTENANCE
General
Check all hydraulic brake lines and fittings at retarder
control valve for leaks and damage. Tighten/replace
as required.
Every 1 000 Hours
Check retarder pressure at diagnostic test point as
follows:
a. Connect a hydraulic gauge capable of recording a
pressure of 0 - 70 bar (0 - 1 000 lbf/in
pressure point for rear brake/retarder pressure.
SPECIAL TORQUE SPECIFICATIONS
FIG. NO.
1
1
SM 1601 Rev 1 11-00
2 ) to diagnostic
ITEM NO.
21
33
Braking System - Retarder Control Valve
b. Start engine and bring hydraulic oil temperature to
operating temperature.
c. Actuate retarder control valve fully and check
reading on pressure gauge. Pressure reading should
be 33 ± 1.7 bar (480 ± 25 lbf/in
If the pressure is outwith the specified pressure
range, inspect the valve and take relevant action
(adjust pressures, strip down and repair or replace
valve).
Retarder Light Pressure Switch
The retarder light pressure switch is a normally open
switch. Attach a continuity tester to terminals on the
pressure switch. The circuit should be open.
As retarder pressure increases to 2.7 bar (39 lbf/in²)
and above, the circuit should close and send a signal
to illuminate the retarder indicator light in the dash
panel, and the retarder light at the rear of the truck.
As pressure drops below 2.7 bar (39 lbf/in²) the
circuit should open and the retarder lights should go
out.
SPECIAL TOOLS
There are no special tools required for procedures
outlined in this section. Refer to Section 300-0070,
SERVICE TOOLS, for part numbers of general
service tools and adhesives required. These tools,
and adhesives are available from your dealer.
ITEM NAME
Capscrew
Capscrew
* * * *
Section 250-0130
2
).
TORQUE
Nm lbf in
20 - 21 180 - 190
20 - 21 180 - 190
11