Alamo MACHETE Product Service Manual page 78

PUMP - MANUAL SERVO CONTROL ASY
MANUAL SERVO CONTROL DIS-ASSEMBLY: (Used 1997 & Down)
1. The following instructions apply to Manual Servo Control Dis-Assembly
(See Figure 32)
2. Clean, Make Sure that every thing, Pump, Connections, Tools, Work Bench, Vise and
all general conditions are very clean before beginning any work.
3. Input Shaft Removal, Remove Wiper Seal (item 16) with Screwdriver. Remove Set
Screw (item 13) retaining Input Shaft (item 14) and remove it from Control Housing.
4. Valve Spool Plug, Remove Set Screw (item 8) from Plug (item 2) retaining Valve
Spool (item 7) and remove Plug. Remove O-Ring (item 3) if it did not come out with
plug or remove after Valve Spool is removed.
5. Feedback Link and Bell Crank, Remove E-Ring (item 11) from Pin (item 10)
retaining Feedback Link (item 9). Remove Feedback Link and Bell Crank from Control
Housing, Head Pin (item 17) is a press fit into Bell Crank, Removal of Head Pin is not
required as part of repair unless it is damaged.
6. Valve Spool, Remove Valve Spool (item 7) from Housing after Step 5 is done, Compress
Spring (item 6) on Spool and remove E-Ring (item 4), This allows Spring Retainer (item
5), Spring (item 6) and other Spring Retainer (item 5) to slide off of Valve Spool.
7. O-Rings and Cleaning Parts, Make sure all O-Rings are removed from Housing,
(Throw away all old O-Rings). Inspect and clean all parts, clean all Parts with Clean
Solvent and Dry with Compressed Air Only (See introduction section for more cleaning
information). Lubricate all parts in preparations for re-assembly.
MANUAL SERVO CONTROL RE-ASSEMBLY: (Used 1997 & Down)
1. The following instructions apply to Manual Servo Control Re-Assembly
(See Figure 32)
2. Clean, Make Sure that every thing, Parts, Tools, Work Bench, Vise and all general
conditions are very clean before beginning any work. Make sure all parts are lubricated.
3. Valve Spool Spring, Install Spring Retainer (item 5), Spring (item 6) and second
Spring Retainer (item 5) onto Valve Spool (item 7). Compress Spring by pushing on outer
Spring Retainer and install E-Ring (item 4) onto Valve Spool.
4. Valve Spool, Install Valve Spool assembled into Control Housing (item 1) making sure
that the metering notches (See Figure 32) are facing outward and can be seen through
the Metering Ports, Check the notches at this time, if the notches cannot be seen it will
not work.
5. Feedback Link and Bell Crank, Bell Crank (item 12) should have Head Pin (item 17)
already installed. Position Bell Crank in Housing, Slide Feedback Link (item 9) into
position between Clevis on Valve Spool aligning holes, install Retaining Dowel Pin (item
10) and E-Ring (item 11).
6. Input Shaft, Install New O-Ring (item 15) onto Input Shaft (item 14), Hold Bell Crank
in position with Feedback Link Slot and align Splined Hole of Bell Crank with Input Shaft
Cavity. Install Input Shaft into Control Housing and Bell Crank. Apply Locktite # 242 or
equivalent to Set Screw (item 13) and install it to retain Input Shaft. Tighten Set Screw till
it bottoms out against Input Shaft and then back it out 1/4 turn.
7. Wiper Seal, Install Wiper Seal (item 16) on Input Shaft and seat into Control Housing.
8. Valve Spool Plug, Install New O-Ring (item 3) onto Valve Spool Plug (item 2) and install
Plug, Tighten Plug till there is no play in Valve Spool with Input Shaft held stationary. Lock
in place with Set Screw (item 8), Torque Set Screw to 17 to 25 in. lbs. (2 to 3 nm)
Machete (Service Manual) 04/04
© 2004 Alamo Group Inc.
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