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6

Valve Replacement

Erratic or low-pressure operation may be the result of

debris in the Valves or Worn Poppets and/or Seats.

1. Remove the Plugs; then using needle nosed pliers,

remove the Valves (See Figure 10).

2. Remove and discard the old O-ring (See Figure 10).

3. Inspect the Valves for signs of debris and/or wear.  If

worn or damaged, replace the Valves and install new

O-rings (See Figure 10).

4. Install the Plugs and tighten them to 25 ft. lbs. 

[33.9 Nm] torque (See Figure 10).

Figure 10

Plug

Plug

O-ring

O-ring

O-ring

O-ring

Valve

Valve

Hydraulic Motor Repair Instructions

Disassembly and Repair of the Hydraulic Motor

The work area and motor should be as clean as possible

to prevent contamination of parts.

1. Remove the motor from the pump assembly and place

Hydraulic Motor in vise.

2. Remove Tank Port Adapter and Pressure Port Adapter

with large crescent wrench or 1-1/16" and 1-3/8” box

end wrench (See Figure 11).

3. Using a 9/16" box end wrench, loosen the nut on the

Bypass Adjusting Screw (See Figure 11a).

4. Using a small screwdriver, remove the Bypass

Adjusting Screw from the Motor. (This will remove the

Screw, Nut, Washer and Thread-Seal Gasket.)

5. Using a 1/4" Allen wrench, remove the Socket Head

Cap Screws from the Motor End Plate (See Figure

11).

6. If Motor End Plate will not lift off easily, use a small

screwdriver to carefully pry apart the boss portion of

the End Plate and Gerotor Housing until free (See

Figure 12). If Gerotor Housing will not lift off easily,

carefully pry apart the boss area between the Gerotor

Housing and the Motor Body. (It may be necessary to

alternate sides when prying apart Motor sections.)

Figure 11

Figure 11a

Figure 12

7. Remove both parts of the Gerotor.
8. Remove the Roll Pin from the Shaft.
9. Remove the o-ring from the Motor End Plate and

Body with a flat instrument such as a knife blade.

10. Inspect Motor End Plate, Body and Gerotor Housing

for wear and/or gouging. If gouging has occurred in

both the Motor End Plate and Body, the motor is not

repairable. If gouging has occurred in the Motor End

Plate, Body or Gerotor Housing, the part that is worn

must be replaced. If Gerotor Housing is damaged,

Gerotor parts must also be replaced.

To Remove the Shaft Assembly from the Motor Body

Special attention should be exercised when working

with retaining rings. Always wear safety goggles

when  working  with  spring  or  tension  loaded

fasteners or devices.

1. Using the large retaining ring pliers, remove the

Retaining Ring next to the Ball Bearing in the Motor

Body.

Summary of Contents for HYPRO 1802C

Page 1: ...ssure Washers with Hose and Gun Assembly Model Max Max Estimated Number GPM PSI GPM PSI Description Weight Ea Hydraulic Motor Requirements Installation Operation Repair and Parts Manual Rev B Description HYPRO California Proposition 65 Warning This product and related accessories contain chemicals known to the State of California to cause cancer birth defects or other reproductive harm Notes are u...

Page 2: ...hand to check the condition of hydraulic lines or hoses If hydraulic fluid penetrates the skin get medical help immediately Failure to get proper medical help may result in loss of limb or life The safest way to check hydraulic lines or hoses is by holding a piece of cardboard next to the hydraulic line or hose The sound pressure level of the Pump may exceed 80dBA Observe all safety precautions wh...

Page 3: ... clockwise CW or counterclockwise CCW 6 Your Pressure Washer is equipped with the optional Detergent Injection System The nozzle must be set in Low Pressure Mode to activate the injector and draw soap For rinsing the nozzle should be set in High Pressure Mode Pushing the black nozzle body forward places the nozzle in the Low Pressure Mode Pulling the black nozzle body back places the nozzle in the...

Page 4: ...ng Systems Flow and Pressure Compensating The Closed Center Flow Compensated System is a variation of the Pressure Compensated System designed primarily for more efficient operation and the generation of less heat It works on the principle of maintaining a constant pressure drop from the pump to the working port of the Selector Valve Any variation in demand at the Motor will cause a change in flow...

Page 5: ...rews securing the pump head to the pump body See Figure 3 2 While turning the crankshaft use two screwdrivers to carefully pry between the pump head and pump body to remove the pump head See Figure 4 3 Using Extractor Pliers remove the Seal Retainers and Seals See Figure 7 4 Using a small blade knife remove the Seals from the Seal Retainers 5 Figure 5 Figure 6 5 Lightly lubricate and install new s...

Page 6: ... Using a 1 4 Allen wrench remove the Socket Head Cap Screws from the Motor End Plate See Figure 11 6 If Motor End Plate will not lift off easily use a small screwdriver to carefully pry apart the boss portion of the End Plate and Gerotor Housing until free See Figure 12 If Gerotor Housing will not lift off easily carefully pry apart the boss area between the Gerotor Housing and the Motor Body It m...

Page 7: ... looks like a thick washer approx 130 inch thick 5 Before installing the new seal its lip must be expanded to fit on the shaft With the seal lip facing out slide the seal over the threaded end of the shaft and gently push the seal onto the raised area of the shaft Do not push the seal past the large retaining ring groove on the shaft 6 Once the seal has been expanded remove the seal from the shaft...

Page 8: ...ing groove on the shaft 5 Once the seal has been expanded remove the seal from the shaft Weep hole Reassembly of Remaining Hydraulic Motor Parts 1 Place Motor Body in a vise with large end of shaft facing up 2 Install the o ring in the body 3 Install the Roll Pin on the shaft Place the Inner Gear of the Gerotor onto the shaft making sure Gerotor slot lines up with the key in the shaft The Roll Pin...

Page 9: ...er 13 Remove Hydraulic Motor from the vise Turn shaft by hand to check for binding 14 Install Motor into Pump Mounting Flange Insert four Hex Head Bolts then alternately and evenly tighten them m o t p m y S e s u a C e l b a b o r P n o i t c A e v i t c e r r o C e g r a h c s i d w o L d e m i r p t o n s i p m u P e h T p m u P e h t e m i r P e n i L n o i t c u S e h t n i s k a e l r i A t ...

Page 10: ...10 Typical Hydraulic Circuit Schematics for Hydraulic Driven Pressure Washers Figure 16 Typical Hydraulic Circuit Schematics for Hydraulic Driven Pressure Washers ...

Page 11: ...11 Mounting Dimensions Figure 17 Mounting Dimensions ...

Page 12: ... 1 23 9910 880130 Oil Plug 1 24 9910 1260110 Nut 3 252 9910 1260100 Washer 3 262 3500 0061 Piston 3 272 9910 480480 O ring 3 282 9910 1260091 Spacer 3 29 9910 1260070 Guiding Piston 3 30 9910 1260080 Piston Pin 3 Ref No Part No Description Qty 31 9910 1260760 Socket Head Cap Screw 6 32 9910 1269101 Complete Cover 1 36 9910 1260060 Connecting Rod Aluminum 3 36 9910 1320140 Connecting Rod Bronze 180...

Page 13: ... 9910 KIT1864 2 Denotes Piston Kit item 9910 KIT2746 3 Denotes Oil Seal Kit item 9910 KIT2787 4 Denotes Water Seal Kit item 9910 KIT2747 5 Denotes Support Ring Kit item 9910 KIT2745 Ref No Part No Description Qty 25 9910 1260110 Nut 3 26 9910 1380141 Base 2 27 9910 740290 O ring 2 28 9910 1980740 Plug 2 29 9910 1260470 Screw 4 303 9910 1260460 Seal 3 31 9910 1780120 Rear Piston Guide 3 324 9910 77...

Page 14: ...ner 1 5 N A Plunger 61 1 Sold in kit only Cup 7 N A Sleeve 81 1 Sold in kit only Cup 9 N A Valve Body 10 N A Bypass Poppet 11 N A Bypass Seal Outlet 12 1720 0004 O ring 1 13 2404 0164 Bypass Adapter 1 14 1600 0041 Poppet Pin 1 151 1 Sold in kit only O ring 1 16 N A Check Valve Poppet 17 N A Check Valve Spring 18 1830 0115 Poppet Retainer 1 19 1720 0004 O ring 1 20 1720 0064 O ring 1 21 2404 0164 B...

Page 15: ... 1 51 Repair Kit Item Washer 1 61 1720 0196 O ring 1 71 1720 0163 O ring 1 81 3210 0080 Valve Seat 1 91 1720 0190 O ring 1 101 3320 0035 Piston 1 111 1900 0161 Spring 1 121 Repair Kit Item O ring 1 131 Repair Kit Item O ring 1 14 9900 38FPB Quick Disconnect Male End 1 15 3430 0487 Bolt Kit Assembly BSP 1 Figure 21 Unloader Assembly Items 1 2 3 4 5 6 7 8 9 10 11 15 12 13 14 1 Denotes Parts Kit item...

Page 16: ...0088C Motor Assy Models 1802C 1803C 1804C 1805C 1 30 2500 0087C Motor Assy Models 1806C 1807C 1824C 1825C 1826C 1827C 1 Figure 22 Ref No Part No Description Qty 1 1820 0013 Retaining Ring Int 1 2 1 1 2000 0010 Ball Bearing 1 3 1410 0131 Front Cartridge 2010 newer models 1 3 1410 0073 Front Spacer Models before 2010 1 4 1 1 1720 0268 O ring 2010 newer models 2 4 Not used in Models before 2010 5 1 1...

Page 17: ...em Retainer 1 13 N A Seat 3381 0018 1 13 N A Seat 3381 0018 Std 1 14 N A O ring 1 15 Repair Kit Item Ball 1 16 Repair Kit Item Spring 1 17 Repair Kit Item O ring 1 18 Repair Kit Item Retainer 1 19 2270 0068 Seal Washer 2 20 N A Tube Inlet 1 21 2404 0224 Tube Adapter 1 22 2200 0038 Screw 7 Figure 24 Gun Replacement Components 5 3 2 2 4 1 21 19 20 19 2 14 16 18 17 15 13 11 9 7 12 10 8 6 1 22 Repair ...

Page 18: ...18 Notes ...

Page 19: ...19 Notes ...

Page 20: ...deration Hypro reserves the right to request a Material Safety Data Sheet from the returnee for any pump product it deems necessary Hypro reserves the right to disposition as scrap products returned which contain unknown fluids Hypro reserves the right to charge the returnee for any and all costs incurred for chemical testing and proper disposal of components containing unknown fluids Hypro reques...

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