Terex C5000 Series User manual

TEREX UTILITIES TECHNICAL SUPPORT TEAM
PHONE: 1-844-TEREX4U (1-844-837-3948) | EMAIL: [email protected]
MODEL(S): TOOLS NEEDED:SERVICE CALL:
NO.
ADJUSTING SYSTEM RELIEF
PRESSURE C4000, C5000, C6000, GENERAL HYDRAULIC PRESSURE GAUGE (0-5000 PSI)
9/16” OR 3/4” WRENCH
SET OF STANDARD ALLEN WRENCHES
ADJUSTING SYSTEM RELIEF PRESSURE
02

DANGER
Failure to obey the instructions and safety
rules in the appropriate Operator’s Manual and
Service Manual for your machine will result in
death or serious injury.
Many of the hazards identied in the
Operator’s Manual are also safety hazards
when maintenance and repair procedures are
performed.
DO NOT PERFORM
MAINTENANCE UNLESS:
√You are trained and qualied to perform
maintenance on this machine.
√You read, understand and obey:
•manufacturer’s instructions and safety rules
•employer’s safety rules and worksite
regulations
•applicable governmental regulations
.
√You have the appropriate tools, lifting
equipment and a suitable workshop.
The information contained in this Tech Tip is a
supplement to the Service Manual. Consult the
appropriate Service Manual of your machine for
safety rules and hazards.
PAGE 2 OF 6
TECH TIP 02 | RELEASED 10.07.2020 | VERSION 1.0
TECH TIP 02 | RELEASED 10.07.2020 | VERSION 1.0
©TEREX UTILITIES. ALL RIGHTS RESERVED

Escaping uid under pressure can penetrate skin causing serious injury.
Relieve pressure before disconnecting hydraulic lines. Keep away from
leaks and pin holes. Use a piece of cardboard or paper to search for leaks.
DO NOT use your hand.
TECH TIP 02 | RELEASED 10.07.2020 | VERSION 1.0
STEP 1
Determine gauge installation location:
• Units with HOP: Use port G1 on HOP
manifold
• Units without HOP: Tee gauge in the
control line for lift-up between cylinder and
control valve.
See Figure 1 for Sensing Manifold with a G1
location. P/N 485770.
See Figure 2 and Figure 3 for locations on
where the sensing valve may be found on your
unit. An individual sensing valve may also be
located under the rider seat on the command
post.
INTRODUCTION
When setting system relief, it must be veried
that system pressure is present at the base of
the lift cylinders.
If system pressure is not present or improperly
set, the unit may not be able to lift the
capacities shown on the load chart.
This is the reason why pressure is checked at
the base of the lift cylinders or by hooking into
Hydraulic Overload Protection (HOP).
STEP 2
Install the gauge in the location indicated in Step 1. The boom must be supported by the boom rest
or the lift cylinders must be fully retracted before attempting to install the gauge.
PAGE 3 OF 6

TECH TIP 02 | RELEASED 10.07.2020 | VERSION 1.0
10. DS - Digger shift
11. Lower Pressure Drains
12. PS2 - Overload protection for lift cylinders
13. PS1 - Overload protection for gearbox
14. SH - Shuttle valve
15. PO - Pilot set check valve
16. CV - Check valve.
17. S1 - Solenoid for pressure auger release
18. S2 - Solenoid for digger shift.
Not Shown: RP - Reduced Pressure
FIGURE 1
1. COMP - Rod side of lift cylinders.
2. HOP - To dump cartridges on control valve.
3. Base Lift - To lift cylinder base end.
4. G1 - Gauge Port. Normally plugged.
5. G2 - Gauge Port. Normally plugged.
6. Rot LS - Sensing Line from gearbox.
7. Rot LS - Reduced pressure to gearbox.
8. PAR - Pressure auger release.
9. P - Pressure In.
FIGURE 2
1. Test Port Location
1 1
FIGURE 3
1. Test Port Location
PAGE 4 OF 6

TECH TIP 02 | RELEASED 10.07.2020 | VERSION 1.0
STEP 5
If pressure if not at desired level, locate the
return manifold in the pedestal. See Figure 4
for an image of this manifold.
Adjust clockwise to increase the setting; or
adjust counterclockwise to decrease the
setting. Set the pressure to value listed on the
unit-specic placard.
Figure 5 show a return manifold with the
current style system relief cartridge.
STEP 3
Operate unit to bring hydraulic uid to normal
operating temperature.
STEP 4
Raise the boom to full elevation or attach to a
solid object with the load line. The object must
be heavier than what is indicated on the load
chart.
Set the throttle to the maximum setting and
engage the lift-up control. Verify on the gauge
that the pressure is set to what is shown on the
unit-specic placard.
FIGURE 4
1. System Relief
1
FIGURE 5
1. System Relief
PAGE 5 OF 6

FOR FURTHER ASSISTANCE,
CONTACT THE TEREX UTILITIES TECHNICAL SUPPORT TEAM
PHONE: 1-844-TEREX4U (1-844-837-3948) | EMAIL: [email protected]