H Y D R A U L I C
S Y S T E M
ADJUSTMENT PROCEDURE FOR THE
ATTACHMENT PILOT VALVE
Move the lift control lever to FLOAT position to
release pressure in the pilot oil system. Shut off
the engine.
T o o l s
N e e d e d :
6 V 4 1 6 1 H y d r a u l i c T e s t G r o up
1.
2.
3.
A T T A C H M E N T P I L O T V A L V E
1. Actuator. 2. Boot. 3. Bolts (two). 4. Jam nuts (two). 5.
Sleeve for close or lower stem. 6. Sleeve for open or raise
stem. 7. Jam nut. 8. Jam nut. 9. Pin. 10. Passage from
close or lower stem. 11. Passage from open or raise stem.
Disconnect the lever for attachment control
from actuator (1). Remove boot (2) from the
actuator.
Remove pin (9) and actuator (1).
Loosen jam nuts (7) and (8).
TM 5-3805-258-24-1
T E S T I N G
A N D
A D J U S T I NG
Close or Lower Stem Adjustment
4.
5.
6.
7.
8.
9.
10.
Disconnect the hose from passage (10) at the
bottom of the attachment pilot valve.
Install hose with the pressure gauge (0 to 4150
kPa or 0 to 600 psi) on the connector in passage
(10).
Start the engine and check the pressure on the
gauge. If the pressure on the gauge is not 0 kPa
(0 psi), loosen (turn counterclockwise) sleeve (5)
until the pressure is 0 kPa (0 psi).
Tighten (turn clockwise) sleeve (5) until the
pressure on the gauge is 300 ± 50 kPa (43 ± 7
psi).
Loosen sleeve (5) one turn. The pressure on the
gauge will go to 0 kPa (0 psi). Tighten jam nut
(8) to 30 ± 15 N.m (22 ± 11 lb. ft.).
Stop the engine. Remove the pressure in the pilot
system and remove the test equipment.
Connect the hose to the connector in passage
(10) of the pilot valve.
Open or Raise Stem Adjustment
11.
12.
13.
14.
Disconnect the hose from passage (11).
Do Steps 5 through 9 again, only adjust sleeve
(6) this time and tighten jam nut (7).
Connect the hose to the connector in passage
(11).
Install actuator (1) and pin (9).
Actuator Adjustment
15. Loosen two jam nuts (4) and adjust bolts (3) so
that actuator (1) is vertical. Also adjust bolts
(3) just enough to remove free play (move-
ment) from the actuator.
16. Tighten jam nuts (4) to 12 ± 4 N-m (9 ± 3 lb.
ft.).
17. Install boot (2) and the lever for attachment
control.
18. Remove the air in the attachment part of the
pilot oil system, see PROCEDURE TO RE-
MOVE AIR FROM PILOT SYSTEM.
4-75
