Denison Hydraulics P07 C-mod, Service Information, Page: 45 / 80

ROTARY SERVO CONTROL
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DISASSEMBLY
1. See Figure 15. Remove 2 screws holding body (16) to cap assembly (1).
2. Remove all parts from body (16) except pin (30) and arm assembly (28). It is not necessary to remove these parts
unless broken or worn. Examine parts for wear or damage.
3. Remove screw (3). Examine head for excessive wear, and body for smooth sealing surface with O-ring.
4.
See Figure 16. Remove tube lines to cap assembly.
5. Remove screws holding cap assembly to pump body.
6. Remove cap assembly (1). Remove plug (4) with attached parts. Remove spring (11) and spool (6).
7. Do not remove sleeve in body (1). Sleeve is pressed into cap and finished to size. If sleeve or cap is worn, replace
the cap-sleeve assembly (1).
8. Remove screw (13) and nut (14). Push a rod through the cap to remove the retainer (7).
ASSEMBLY
See page 26 for tightening torque on plugs
1. See Figure 16. Install Avseal plug (9) in cap.
2. Install spool (6) into bore as shown. Install spring (11) over end of spool.
3. Install O-ring (8) on spring retainer (7). Install retainer (7), screw (13) and nut (14) in plug (4).
4. Install O-rings (10) and (15) on plug (4). Install plugs (4) and (12) in body (1). Install .047”, 1,19 mm orifice (19),
and .071”, 1,98 mm orifice (20), and plugs (2) and (17). Torque plugs. Install O-ring (21) in cap.
5. Turn screw (13) in until spring retainer (17) contacts spring (11). Turn an additional 1-1/2 turns and lock in position.
6. Note proper location for control on pump (pg. 24). Install O-rings on interface between cap and pump control pad.
Install cap on pump control pad, guiding the control piston into the bore.
7. Torque two assembly bolts to 75 lb. • ft., 102 N m.
8.
See Figure 15. Apply thread sealing compound on threads of screw (3), lubricate the shank, thread through the cap
into the control piston, and torque to 5 lb. • ft., 6,78 N m.
9. Install minimum stop screw (24) and turn clockwise to by two springs, one which is always in contact with the pin,
and the other comes in contact as pressure increases, to provide an increase in spring rate as pressure increases.
Stroke pump to full displacement.. Measure height from control cap to top of screw (3). With control piston at full
displacement, dimension must be ..74 +/- .03 in., 18,8 +/- 0,76 mm.
Back out minimum stop screw (24) till there is no contact with control piston.
10.Press dowel (30) into body (16), through the link (28), to 1/4 in., 6,35 mm below surface. Apply hydraulic
sealant to threads of screws (39) and install over dowel (30).
11. Press spool (21) into retainer (19). Caution: do not use excessive force.
12.While sleeve (27) is engaged into dowel on link (28), slide above spool assembly with spring (15) into bore of body
(16), and through sleeve (27). Spool (21) must move freely and easily at all positions of the link (28).
13.Press dowel (34) through slide pin (14), while inside shaft (10). Dowel (34) must evenly extend from both sides of
slide pin (14).
14.Assemble all other components into body (16) per Figure 15. Torque plug (12)
15.While spring retainer is engaging clevis pin (5) under dowel of link (28), slide the other opening of spring retainer
over the top of the screw (3). Attach body assembly (16) to cap (1) with two screws and torque to 75 lb. • ft., 103 N m.
Figure 16
Servo cap
PORT
“C2”
DIFFERENTIAL
ADJUSTMENT
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