Pitch Pressure Check
To gain access to the pitch block (Figure 50), removal of the
Pitch pressure must be measured with at least one of the pitch switches activated. When pitch switches are unactivated, the pitch pressure will be the same as the charge/steering pressure. Proper pitch pressure is 2300 PSI (2250 - 2350 PSI).
PITCH BLOCK | PITCH PRESSURE |
| |
| TEST PORT |
Figure 50. Pitch Block Location
1.Install 3000 PSI range pressure gauge to pitch pressure test port on pitch block, (Figure 51).
PRESSURE GAUGE
(3000 PSI)
|
| 2000 | 30 | 0 | 0 |
|
|
|
| ||
1 | 000 | 150 | 200 |
| 00 |
|
| ||||
|
| 100 | 250 |
| 40 |
|
| 50 | 300 |
|
|
bar
psi 5000
WIKAPITCH
BLOCK
PITCH
PRESSURE
TEST PORT
Figure 51. Pitch Pressure Test Port
mAINTENANCE
2. Press the left pitch rocker switch downward.
| RIGHT ROCKER |
UP | SWITCH |
|
LEFT ROCKER
SWITCH
DOWN
Figure 52. Pitch Pressure
(Left Pitch Rocker Switch)
3.The blades should fatten out (bottom out the pitch cylinders).
4.Continue to hold down the left pitch rocker switch and record pressure.
Pitch Pressure Out of Specification
NOTICE
The Pitch Pressure Relief Valve is SET AT THE FACTORY, and normally should not require adjustment. If all other systems are found not to be defective, then the pitch relief valve is suspect, the following steps can be used to adjust the valve.
If the pitch pressure check is not within specification, check for the following:
Correct hydraulic fluid level.
Plugged hydraulic oil filter
Loose or leaking fittings.
Ruptured/damaged hydraulic lines.
Faulty hydraulic pump.
Pitch Pressure Relief Valve no longer at factory setting.
page 42 — eHtx44y
