National Crane Published 10-30-2014 Control # 040-09 5-47
1400H OPERATOR AND SERVICE MANUAL SERVICE
SERVICING THE OUTRIGGER, STABILIZER
AND TURN CONTROL VALVE
Before servicing the control valve, please familiarize
yourself with the valve, plumbing components, mounting
area and environment. Only work on the valve in an
environment free from contamination so that the stipulated
contamination level of oil is not exceeded. All valve
connections and plumbing components must be plugged
until connections are made.
Replacing Spool Seals
1. Remove both capscrews and bonnet from spring end of
spool.
2. Carefully remove the compressed spring package and
spool (one side only).
3. Remove both capscrews from bracket on linkage end of
spool and remove bracket.
4. Remove spool seals and thoroughly clean spool seal
counterbores.
5. Lightly oil new spool seals and install in counterbores.
6. Reinstall all components in the same order as they were
removed.
7. Torque spring spacing screw and capscrews to 50 lb-in
(6 Nm maximum.
Replacing Section Seals
1. Remove the tie rods with a 17 mm open wrench or
socket and pull the sections a part.
2. Thoroughly clean O-ring surfaces on each section.
Replace section seals with the proper O-rings for tank
gallery and Quad-rings for the pressure channels.
3. Reinstall the sections in same order as they where
removed. Tighten tie-rods in two steps. Torque all three
rods to 11 lb-ft (15 Nm then torque all three rods to 20
lb-ft (27 Nm).
Tightening Torques (maximums)
1. Main Studs - Initial Torque...................11 lb-ft (15 Nm)
Final Torque ........................................20 lb-ft (27 Nm)
2. Main Relief Valve ................................35 lb-ft (47 Nm)
3. Anti Cavitation Valve ...........................40 lb-ft (54 Nm)
4. Bonnet and Bracket .............................50 lb-in (6 Nm)
5. Steel Plugs (SAE #10).........................50 lb-ft (68 Nm)
To Next Page
Loading...
