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15. Push the valve spool out of the valve handle.
16. Remove the spool screw (6) from the valve spool by
unscrewing it.
17. Remove o-rings (4) and discard them.
18. Remove the o-ring (3) and discard it.
PARTS INSPECTION
Inspect and clean all parts as follows:
Clean all parts with a degreasing solvent. Blow dry with
compressed air and wipe clean. Use only lint-free cloths.
KNIFE BLADE, HOOK, LINK BAR
& SLIDE HEAD ASSEMBLY
1. Inspect the knife blade and hook for wear. Sharpen as
explained in the OPERATION section of this manual.
2. Inspect the link bar for damage. Make sure the clevis pin
holes are not worn. Replace if damage or wear is noted.
3. Inspect the slot of the slide head for excessive wear.
Make sure the knife bolt hole is not worn. Replace if dam-
age or wear is noted.
INTERNAL TUBE
4. Inspect the fi berglass portion of the internal tube for
cracks or damage paying particular attention to the areas
where the aluminum rods and fi berglass join. Also inspect
the threaded ends of the tube for damage. The internal
tube is not fi eld serviceable. Replace if damage or wear is
noted.
EXTERNAL TUBE
5. Inspect the fi berglass portion of the external tube for
cracks or damage. Inspect the metal collars and fi berglass
joints to be sure the joints are secure. Do not try to remove
the metal collars as they are not fi eld serviceable. If the
tube is damaged or the joints are loose, replace the assem-
bly.
PISTON ROD & PISTON
6. Inspect the piston rod, piston and cylinder for extensive
wear or deep scratches which might cause premature seal
failure. Some surface scuffi ng is normal.
SERVICE
VALVE SPOOL & VALVE HANDLE
7. Inspect the valve spool and bore of the valve handle for
excessive wear or deep scratches which might cause pre-
mature seal failure. Some surface scuffi ng is normal.
HYDRAULIC SUPPLY
8. Finally, - check the hydraulic power supply system for
contamination in the fl uid and for fi lter condition. Also,
make sure hoses and couplers are in good condition.
VALVE HANDLE ASSEMBLY
1. Apply grease and install o-rings (4) into the valve handle
(7).
2. If the spool screw (6) was removed from the valve spool
(5), install it using Loctite™ 242. Lubricate the spool with
hydraulic fl uid and install it into the valve handle as shown
in the parts drawing.
3. Slide the spring (12) over the valve spool. Position the
trigger (46) against the valve spool and spring, align the roll
pin hole in the spool with the hole in the trigger and then
install the roll pin (11).
4. Align the other roll pin hole in the trigger with the roll pin
hole in the trigger guard (10) and install the roll pin (11).
Align the screw holes in the trigger guard with the screw
holes in the valve handle and then install the screws (9)
using Loctite™ 242..
5. Apply grease and install the o-ring (3) onto the valve
handle.
CYLINDER & CYLINDER OIL TUBE
6. If the cylinder oil tube (2) was removed, install it into
the threaded hole in the valve handle. Use oil tube clamp
01239.
7. Screw the cylinder (1) onto the valve handle until it is
fl ush with the ridge on the valve handle. Hard tighten the
assembly.
PISTON & PISTON ROD
8. For c.c. systems, screw the piston (16) onto the piston
rod (21) using Loctite™ 242. For o.c. systems, skip this
step and proceed to step #9.
16
PRUNER ASSEMBLY
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