BUCKET PLUNGER SECTION
Note the position of parts during disassembly so
they can be reassembled in the correct position.
Mark both covers (2 & 14) to insure correct reas-
sembly. Remove the eight socket screws (1). cover
(2). O-rings (3 & 4). springs (5). and washers (8).
IMPORTANT: Mark each spool (6 & 7) with re-
spect to their proper bore and position (top and
bottom) before removing spools from plunger sec-
tion. Reversing spools will result in the malfunction
of this section.
The spools are a select fit and it may be necessary
to turn section on an angle to facilitate removal.
Identification of each poppet (9 & 10) with respect
to its spool is mandatory. Remove spools (6 & 7),
p o p p e t s (9 & 10) and check valve (11). Remove
eight socket screws (13), blank cover (14), springs
(12) and O-rings (15).
Clean all parts (including subassemblies in sol-
vent and dry with compressed air. Examine all O-
for breaks or distortion. Inspect both the poppet
f a c e s and corresponding seating surfaces in the
spools. All seats must be sharp and free of nicks.
Examine spools and bores for scratches or scoring.
Test spools for fit in their respective bore. Spools
should fit snugly without binding through a com-
plete revolution. Follow same procedure for fit be-
t w e e n the check valve and housing. Inspect the
flow passages in spools and spool covers. These
passages must be clean and free from foreign par-
t i c l e s . Clean passages with compressed air. Re-
place defective parts.
Coat all parts, including housing bores, with hy-
draulic oil. Insert poppets (9 & 10) into spools (6
& 7). POPPETS MUST BE INSTALLED IN CORRECT
Install washers (8) and springs (5 & 12) into spools
(6 & 7). Slide spools into their respective bores. IT
IS VERY IMPORTANT THAT SPOOLS ARE POSI-
Place O-rings (3, 4 & 15) into their corresponding
grooves. A light coating of grease will hold them
in place. Install check valve poppet (11). Attach
cover (2) with socket screws (1) and tighten to 60
ft. lb. (8,3 kg. mtrs.). Attach cover (14) with socket
screw (13) and hand tighten.