Hydraulic Pump
Removal
1.
Relieve pressure; page 4.
Let hydraulic system cool before beginning ser- vice.
2.Fig 2. Use 3.5 gallon container to catch hydraulic fluid. Remove reservoir drain plug (133) and drain hydraulic fluid.
3.Remove two screws (141) and fan shroud (23).
4.Remove eight screws (136), washers (81) and reservoir cover (50).
5.Remove cooler clip screw (141).
6.Loosen four engine mounting fasteners and belt tension adjustment screw (Fig. 3). Slide engine to left (rear view) to relieve tension on belt (6). Re- move belt.
7.Remove two set screws (18) and fan (19).
8.Disconnect hydraulic tube (52) from elbow (54) and hydraulic motor manifold (46).
9.Disconnect strainer (25) with elbows (58, 30) assembled, from elbow (139).
10.Remove case drain tube (67).
11.Turn compensator stem (A) clockwise until stop. Loosen set screw (B). Pull compensator stem out. Remove holder (C), spring (D) and coupler (E).
12.Remove two pump bolts (94) from reservoir.
13.Lift hydraulic pump (2) up and toward front of reservoir to remove.
Installation
1.Transfer fittings (53, 139) to new pump (2).
2.Place strainer (25) with fittings (30, 58) assembled, into reservoir prior to installing pump.
3.Attach hydraulic tube (52) to pump (2) with elbow (53). Install new
4.Fig 2. Set hydraulic pump (2) down and toward rear of reservoir to install.
5.Install two pump bolts (94) in reservoir with copper washers (64) on outside under screw heads. Torque to
6.Connect strainer (25) to elbow (139).
7.Connect elbow (54) to hydraulic motor manifold (46). Connect hydraulic tube (52) to elbow (54). Torque hex nuts on elbows (139) and (53) to 38 – 42
8.Insert spring (D) into coupler (E) and put holder (C) on exposed end of spring. Slide assembly (D, E, C) over compensator stem (A). Align flat on compensator stem with set screw (B). Hold com- pensator stem knob and torque set screw to 90
9.Install key (F) on pump shaft and install fan (19) with two set screws (18). Fan hub must overhang shaft approximately 0.20 in.
10.Install belt (6). Do Fan Belt Installation, page 8.
11.Install reservoir drain plug (133).
a.Fill pump with hydraulic oil.
b.Install case drain elbow (24) and tube (67).
c.Fill reservoir to fill level (approximately 2.75 gallons) with Graco hydraulic fluid.
12.Install reservoir cover (50) with eight washers (81) and screws (136). Torque to
13.Install cooler clip screw (141).
14.Install fan shroud (23) with two screws (141).
15.Verify hydraulic pump operation:
a.Run sprayer with hydraulic motor slow stroking and minimum pressure for 2 minutes.
b.Set hydraulic pressure at maximum. Turn pump switch OFF.
c.Check for hydraulic oil leaks. Add hydraulic oil as needed.
