Manitowoc Grove YB5515-2, Руководство по обслуживанию и ремонту

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HYDRAULIC SYSTEM CD5515-2/YB5515-2 SERVICE MANUAL
4-18
Published 1-20-2017, Control# 483-02
5. Shut down the engine and remove the pressure gauge.
6. Install a 0 - 344.73 bar (0-5000 psi) pressure gauge on
the G2 port (3, Figure 4-9) located on the brake/steering
manifold.
7. With the park brake on start the engine. Loosen jam nut
on the UP10 pilot unloading valve (2, Figure 4-9). A 19
mm open end wrench is required for the jam nut.
8. Pump the brakes to lower the accumulator pressure
below 110.32 bar (1600 psi). Keep pumping the brakes
while another person adjusts the accumulator relief
setting by turning the relief valve adjusting screw (2,
Figure 4-9) until 137.90 ± 3.45 bar (2000 psi ± 50 psi) is
obtained on the pressure gauge
;
clockwise increases
pressure, counterclockwise reduces the pressure. A
7mm hex wrench is required for the adjusting screw.
9. Tighten the jam nut against the valve body.
10. Shut down the engine and remove the pressure gauge.
Boom Telescope Extend Pressure Setting
NOTE: Always check/set the pressure on the load sense
relief valve before checking the pressure on the
other valves.
1. With the engine off, install a 0 - 344.73 bar (0-5000 psi)
p r e s su r e g au g e o n t h e l o a d s e ns e te s t p o r t ( 2 ,
Figure 4-6).
2. Extend pressure setting procedure:
a. Set the crane up on outriggers.
b. Operate the extend boom function to fully extend
the boom and hold while another person observes
the pressure gauge, the pressure should be 193.05
+3.45/-0 bar (2800 +50/-0 psi).
c. If the pressure is incorrect, adjust the extend work
port relief valve (3, Figure 4-8) on the control valve
until the pressure reads 193.05 +3.45/-0 bar (2800
+ 5 0 / - 0 ps i ) ; c l o c k w i s e i n c r e a s e s p r e s s u r e ,
counterclockwise reduces the pressure. A 3mm hex
wrench is required for the adjusting screw.
3. Retract the boom and outriggers.
4. Shut the engine off.
5. Remove the gauge.
Outrigger Circuit Pressure Setting
1. Shut off the engine. Install a 0 - 344.73 bar (0-5000 psi)
pressure gauge to the front outrigger manifold test point
(4, Figure 4-6).
2. Start and accelerate the engine to maximum rpm.
3. Actuate the outrigger enable switch to the extend
position while another person observes the pressure
gauge. The pressure should be 172.37 ± 3.45 bar (2500
psi ± 50 psi).
4. Return the control to the neutral position.
5. If the pressure reading is correct, stop the engine and
remove the pressure gauge.
6. If the pressure reading is incorrect:
a. Loosen the jam nut on the outrigger relief valve (3,
Figure 4-6) at the front of the machine on the front
outrigger housing weldment. A 19 mm open end
wrench is required for the jam nut.
b. Start and accelerate the engine to maximum RPM.
c. Actuate the outrigger enable switch to the extend
position.
d. Turn the adjusting screw in or out to obtain 172.37 ±
3.45 bar (2500 psi ± 50 psi). In will increase
pressure; out will decrease pressure. A 3mm hex
wrench is required for the adjusting screw.
e. Tighten the jam nut against the relief valve body.
f. Shut down the engine and remove the pressure
gauge.
Pilot Pressure Setting
1. With the engine shutdown and the parking brake set,
install a 0 - 344.73 bar (0-5000 psi) pressure gauge onto
the pilot test port (5, Figure 4-5) of the control valve.
2. Start the engine and actuate the crane power switch and
read the pressure indicated on the pressure gauge. The
gauge should read 25.00 ± 1.72 bar (362 ± 25 psi). If the
pressure setting is correct shutdown the engine and
remove the pressure gauge. If the pressure setting is
incorrect, verify the supply current to the crane power
solenoid. The pilot pressure setting is not adjustable.
FIGURE 4-9
1
2
3
Reference Only