HYDRAULIC SYSTEM RT880E SERVICE MANUAL
2-24 Published 11-10-2014, Control # 524-00
Procedure H - Swing Work Port Pressure -
Check/Adjust
1. Install pressure check diagnostic quick disconnect with
gauge onto test port at GP5 port of the Front Steer,
Swing and Accessory Manifold (see Figure 2-9).
2. Start engine and throttle up to full RPM. With the swing
house lock engaged, swing right and hold. Adjust the
work port relief “in” to increase or “out” to decrease so
that a gauge pressure reading of 2400 to 2550 psi is
achieved (see Figure 2-9).
3. With house lock still engaged, swing left and hold. Adjust
the work port relief “in” to increase or “out” to decrease
so that a gauge pressure reading of 2400 to 2550 psi is
achieved (see Figure 2-9).
4. Stop engine. Remove diagnostic couplers.
Procedure I - Swing Brake Release Pressure
- Check/Adjust
1. Install pressure check diagnostic quick disconnect with
gauge onto test port at GP3 port of the Front Steer,
Swing and Accessory Manifold (see Figure 2-9).
2. Start engine and idle, adjust the swing brake release
pressure reducing valve “in” to increase or “out” to
decrease so that a gauge pressure reading of 250 to
300 psi is achieved (see Figure 2-9).
3. If a gauge reading of 250 to 400 psi cannot be attained,
stop the engine and install a pressure check diagnostic
quick disconnect with gauge onto the inlet gauge port of
the Main Directional Control Valve (see Figure 2-11).
Start engine and idle. Adjust the piston pump differential
pressure adjusting screw “in” to increase or “out” to
decrease so that a gauge reading of 350 psi is achieved
(see Figure 2-10). Repeat Steps 1 and 2.
4. Stop engine. Remove diagnostic couplers.
Procedure J - Controller Supply Pressure -
Check/Adjust
1. Install pressure check diagnostic quick disconnect with
gauge onto test port at GP4 port of the Front Steer,
Swing and Accessory Manifold (see Figure 2-9).
2. Start engine and idle, lower left armrest, stroke the
joystick of any crane function enough to start movement
of that function and adjust the controller pressure
reducing valve of the Front Steer, Swing and Accessory
Manifold “in” to increase or “out” to decrease so that a
gauge pressure reading of 350 to 400 psi is achieved
(see Figure 2-9).
3. Stop engine. Remove diagnostic couplers.
Procedure K - Counterweight Removal
Cylinder Extend/Retract Pressure - Check
1. With the engine off, and the counterweight pinned,
disconnect the extend hose from port “A” of the
Counterweight Removal Directional Control Valve for
both left and right removal cylinders and cap and plug
the adapter in the cylinder port (see Figure 2-15).
2. Install a pressure gauge onto the disconnected hose.
3. Start engine and idle. Attempt to lower left counterweight
cylinder. Gauge should read 1000 psi ±100. If not,
replace the relief valve as it is non-adjustable (see
Figure 2-15).
4. Stop engine. Remove the pressure gauge and
reconnect the plumbing.
5. With the engine off, and the counterweight pinned,
disconnect the extend hose from port “B” of the
Counterweight Removal Directional Control Valve for
both the left and right removal cylinders and cap and
plug the adapter in the cylinder port.
6. Install a pressure gauge onto the disconnected hose.
7. Start engine and idle. Attempt to raise the left
counterweight cylinder. Gauge should read 1800 psi
±100. If not, replace the relief valve as they are non-
adjustable (see Figure 2-15).
8. Stop engine. Remove the pressure gauge and
reconnect the plumbing.
Procedure L - Cab Tilt Cylinder Extend/
Retract and Counterweight Pin Removal
Pressure - Check/Adjust
1. With the engine off, remove the hose running from the
Cab Tilt Manifold “A” port to the cylinder rod port at the
cylinder and cap or plug the adapter in the cylinder (see
Figure 2-16).
2. Install a pressure gauge onto the disconnected hose.
3. Start engine and idle. Attempt to lower the cab. Gauge
should read 2500 psi ±100. If not, adjust the relief valve
“in” to increase or “out” to decrease pressure (see
Figure 2-16).
4. Stop engine. Remove the pressure gauge and
reconnect the plumbing.
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