Hitachi 309379 warranty Hydraulic Pump, Removal, Installation

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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 o-ring (56) on hydraulic pump flange

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 31–35 ft-lb.

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 ft-lb.

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 in-lb.

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 95–100 in-lb.

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.

6309379

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Contents 309379 Repair PartsTable of Contents HydraMaxr SprayersAdvertência 309379Moving Parts Hazard General Repair InformationGrounding HOT Surfaces Hazard Explosion HazardInjection Hazard MaintenancePressure Relief Procedure SEMI-ANNUALLYTroubleshooting Installation Hydraulic PumpRemoval 141 Bottom View 6425 133 Engine mounting Fasteners 136 139 Removal Installation Fan BeltDisplay and Control Board InstallationPressure Control RemovalGeneral OperationDTS Error Codes After a fault, follow these steps to restart sprayerDisplay Sprayer Indication Action Operation Do Fan Belt, Installation EngineRemoval Do Fan Belt, Removal Hydraulic Motor Top Green RedHydraulic Motor Switches Directional Valve RemovalDisplacement Pump Push retaining spring up push out pinParts Drawing HydraMax 225 Sprayers Parts List HydraMax 225 Sprayers Models 233640163 153 164 154 Ring SpringFitting Spring Holder106 Plug Parts Drawing HydraMax 300/350 Sprayers Parts List HydraMax 300/350 Sprayers Model 233650Ti1390c Shield Ti1391a † Include in Hydraulic Seal Repair Kit Wiring Diagram Parts Drawing HydraMax 225/300/350 SprayersParts List HydraMax 225/300/350 Sprayers Models 233642, 233643, 233651 HydraMax Sprayers with Spray Gun and HosesHydraMax 225, 300 and 350 Sprayers Spray GUNGraco Phone Number Accessories Technical DataDimensions GRACO-APPROVED Hydraulic OILGraco Warranty Additional Warranty CoverageFor Graco Canada Customers