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MULTIQUIP WT8C Series Operation Manual
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MULTIQUIP WT8C Series Operation Manual

MULTIQUIP WT8C Series Operation Manual

Water trailers
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OPERATION MANUAL
MODELS
WT8C AND WT8HP
SERIES
WATER TRAILERS
(HONDA GX120/GX160 GASOLINE ENGINES)
(QP2HLF/QP205SHLF CENTRIFUGAL PUMPS)
Revision #0 (03/06/25)
To find the latest revision of this publication or
associated parts manual, visit our website at:
www.multiquip.com
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
PN: 48913

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Summary of Contents for MULTIQUIP WT8C Series

  • Page 1 WATER TRAILERS (HONDA GX120/GX160 GASOLINE ENGINES) (QP2HLF/QP205SHLF CENTRIFUGAL PUMPS) Revision #0 (03/06/25) To find the latest revision of this publication or associated parts manual, visit our website at: www.multiquip.com THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES. PN: 48913...

  • Page 2: Proposition 65 Warning

    PROPOSITION 65 WARNING PAGE 2 — WT8C/WT8HP SERIES WATER TRAILERS • OPERATION MANUAL — REV. #0 (03/06/25)

  • Page 3: Table Of Contents

    Table of Contents ............. 3 Safety Information ..........4–8 Specifications ............ 9–10 Dimensions .............11 General Information ......... 12–13 Components (WT8C Series) ......14–15 Components (WT8HP Series) ......16–17 Components (Engine) ..........18 Inspection ............19–20 Operation ............21–28 Winterizing Procedure ........29–30 Maintenance ............

  • Page 4: Safety Messages

    SAFETY INFORMATION DO NOT operate or service the equipment before reading Potential hazards associated with the operation of this the entire manual. Safety precautions should be followed equipment will be referenced with hazard symbols which at all times when operating this equipment. may appear throughout this manual in conjunction with Failure to read and understand the safety safety messages.

  • Page 5: General Safety

    „ NEVER use accessories or attachments that are not „ Avoid wearing jewelry or loose-fi tting clothes that may recommended by Multiquip for this equipment. Damage snag on the controls or moving parts, as this can cause to the equipment and/or injury to the user may result.

  • Page 6: Pump Safety

    SAFETY INFORMATION PUMP SAFETY „ ALWAYS allow the machine a proper amount of time to cool before servicing. DANGER „ Keep the machine in proper running condition. „ NEVER operate the equipment in an explosive ENGINE SAFETY atmosphere or near combustible materials. An explosion or fi re could result, causing severe WARNING bodily harm or even death.

  • Page 7: Towing Safety

    SAFETY INFORMATION „ DO NOT overfi ll the fuel tank, as spilled fuel can ignite „ DOT requirements include the following: if it comes into contact with hot engine parts or sparks • Connect and test electric brake operation. from the ignition system. •...

  • Page 8: Emissions Information

    SAFETY INFORMATION ENVIRONMENTAL SAFETY/DECOMMISSIONING EMISSIONS INFORMATION NOTICE NOTICE Decommissioning is a controlled process used to safely The gasoline engine used in this equipment has been retire a piece of equipment that is no longer serviceable. designed to reduce harmful levels of carbon monoxide If the equipment poses an unacceptable and unrepairable (CO), hydrocarbons (HC), and nitrogen oxides (NOx) safety risk due to wear or damage, or is no longer cost...

  • Page 9: Specifications

    SPECIFICATIONS Table 1. Water Trailer Specifications WT8C • WTE8C • Model WT8HP • WTE8HP WT8CHR • WTE8CHR Water Trailer Weight (Water Tank Empty) 2,200 lb. (998 kg) Weight (Water Tank Full) 9,100 lb. (4,128 kg) Type Industrial Style Rotomolded — seamless Fill Port 12 in.
  • Page 10 SPECIFICATIONS Table 2. Engine Specifications Water Trailer Model WT8C Series WT8HP Series Engine Model Honda GX120UT3PX2 Honda GX160U1TX2NH1 Type Air-cooled, 4-stroke, single-cylinder, OHV, horizontal-shaft, gasoline engine Bore × Stroke 2.36 in. × 1.65 in. (60 mm × 42 mm) 2.7 × 1.8 in. (69 × 46 mm) Displacement 7.2 cu.

  • Page 11: Dimensions

    DIMENSIONS NOTICE WT8HP model shown. (TRACK WIDTH) Figure 1. Dimensions Table 3. Dimensions Reference Dimension Reference Dimension Reference Dimension Reference Dimension Reference Dimension Letter in. (mm) Letter in. (mm) Letter in. (mm) Letter in. (mm) Letter in. (mm) 77 (1,956) 62 (1,575) 138 (3,505) 80 (2,032)

  • Page 12: Water Tank

    GENERAL INFORMATION APPLICATION PUMP The WT8C/WT8HP series is an industrial, 800-gallon water The WT8C series (WT8C, WT8CHR, WTE8C and trailer. Each water trailer is equipped with a centrifugal WTE8CHR) is equipped with a Multiquip QP2HLF pump, flexible suction/discharge manifold system with...

  • Page 13: Optional Accessories

    GENERAL INFORMATION ENGINE OPTIONAL ACCESSORIES The QP2HLF centrifugal pump (WT8C series) is powered „ Suction hose — NPT thread by a 3.5-horsepower, air-cooled, 4-stroke, single-cylinder, „ Suction hose — Quick Disconnect coupler Honda GX120 gasoline engine. „ Discharge hose — NPT thread The QP205SHLF centrifugal pump (WT8HP series) is powered by a 5.5-horsepower, air-cooled, 4-stroke,...

  • Page 14: Components (Wt8C Series)

    COMPONENTS ( WT8C SERIES ) Figure 2. WT8C Series Water Trailer Components PAGE 14 — WT8C/WT8HP SERIES WATER TRAILERS • OPERATION MANUAL — REV. #0 (03/06/25)
  • Page 15 15. Engine/Pump Assembly — A 3.5-horsepower, air-cooled, 4-stroke, single-cylinder, Honda GX120 3. Brake Lights — Before towing the water trailer, make gasoline engine connected to a Multiquip QP2HLF sure these lights are operational and are working centrifugal water pump. correctly. DO NOT tow the water trailer if these lights are inoperative.

  • Page 16: Components (Wt8Hp Series)

    COMPONENTS ( WT8HP SERIES ) Figure 3. WT8HP Series Water Trailer Components PAGE 16 — WT8C/WT8HP SERIES WATER TRAILERS • OPERATION MANUAL — REV. #0 (03/06/25)
  • Page 17 16. Engine/Pump Assembly — A 5.5-horsepower, air-cooled, 4-stroke, single-cylinder, Honda GX160 3. Brake Lights — Before towing the water trailer, make gasoline engine connected to a Multiquip QP205SHLF sure these lights are operational and are working high-pressure centrifugal water pump.

  • Page 18: Components (Engine)

    COMPONENTS ( ENGINE ) 3. Engine ON/OFF Switch — ON position permits engine starting, OFF position stops engine operation. 4. Recoil Starter (Pull Rope) — Manual starting method. Pull the starter grip until resistance is felt, then pull briskly and smoothly to start the engine. 5.

  • Page 19: Upper Limit

    INSPECTION BEFORE STARTING Table 4. Recommended Oil Viscosity Grades 1. Read all safety instructions at the beginning of the manual. SAE 30 2. Clean the unit, removing dirt and dust — particularly SAE 5W-30 ∙ 10W-30 the engine cooling air inlet, carburetor and air filter. 3.
  • Page 20 INSPECTION INSPECTING AND CLEANING When drawing water from sources that may include a degree of sediment, debris, and sandy particles, it is THE INLINE FILTER SYSTEM necessary to regularly check and clean out the inline filter (WT8HP SERIES ONLY) (WT8HP series only), which is located adjacent to the pump The WT8HP series water trailer utilizes a high-pressure casing.

  • Page 21: Operation

    OPERATION STARTING THE ENGINE 3. Move the engine throttle lever (Figure 11) away from the slow position, about 1/3 of the way toward the fast NOTICE position. The pump must be primed before the engine is started. To prime the pump, remove the pump fill cap and fill the pump casing with water, then reinstall the fill cap.

  • Page 22: Starter Grip

    OPERATION 6. Place the engine ON/OFF switch (Figure 14) in the 11. To begin pumping, place the engine throttle lever ON position. (Figure 16) in the RUN position. THROTTLE LEVER ENGINE SWITCH Figure 14. Engine ON/OFF Switch (ON) IDLE 7. Slowly pull the starter grip (Figure 15) until resistance Figure 16.

  • Page 23: Stopping The Engine

    OPERATION STOPPING THE ENGINE 3. Place the engine fuel valve lever (Figure 19) in the OFF position. Normal Shutdown 1. Place the engine throttle lever in the IDLE position (Figure 17) and run the engine for three minutes at low speed. FUEL VALVE LEVER THROTTLE...

  • Page 24: Control Handles

    OPERATION CONTROL HANDLES NOTICE Refer to Figure 20 and Table 5 for the various operating The pump must be primed before the engine is positions of the manifold and spray bar control handles. started. To prime the pump, remove the pump fill cap and fill the pump casing with water, then reinstall the fill cap.
  • Page 25 OPERATION IMPORTANT! There is an operating mode (Figure 21) that can be With no hoses attached, this mode of operation causes the harmful to your water pump. NEVER operate the water pump to draw in air, creating unnecessary back pressure. trailer with the spray bar control handle in the right NEVER operate the water trailer in this mode.
  • Page 26 OPERATION FILLING THE WATER TANK (FIRE HYDRANT) 7. Remove the fire hydrant discharge hose and allow the hose to drain. Remove the hydrant adapter. Refer to Figure 22. NOTICE 1. Remove the water tank cap. DO NOT attempt to connect the fire hydrant discharge 2.
  • Page 27 OPERATION FILLING THE WATER TANK (WATER SOURCE) Garden Hose 1. Connect a garden hose between the garden hose 1.5-Inch Or 2.0-Inch Cam And Groove valve and the water source. Male Quick-Disconnect Port 2. Open the garden hose valve. The following procedure shows how to fill the water tank using a swimming pool, pond, lake, river, etc.
  • Page 28 OPERATION DISCHARGING WATER Rear Spray Bar The following processes demonstrate how to discharge 1. Ensure all main manifold dust caps are secured on water from: the cam and groove ports on the main manifold, the male couplers. the rear spray bar, and the hose bib ports. 2.

  • Page 29: Winterizing Procedure

    WINTERIZING PROCEDURE WINTERIZING PROCEDURE 4. Place the manifold control handle in the horizontal/right position (Figure 27). Perform the following procedure to protect the water trailer SPRAY BAR from component damage in freezing weather. GARDEN CONTROL HANDLE HOSE BIB (RIGHT) 1. Make sure the engine is turned OFF and the water tank is completely empty.
  • Page 30 WINTERIZING PROCEDURE 7. Once all water appears to have been drained, lower 9. Once fluid has stopped draining, reinstall the pump the trailer tongue by placing the front jack stand in drain plug (Figure 31) on the pump end. the lowest position (Figure 29). PUMP CASE TRAILER TONGUE...

  • Page 31: Discharge Port

    MAINTENANCE PUMP VACUUM TEST PLACE VACUUM TESTER CAUTION DISCHARGE PORT OVER PUMP SUCTION PORT DO NOT attempt to start the engine unless the pump has previously been primed with water. Severe pump damage will occur if the pump has not been primed. To perform the pump vacuum test: 1.
  • Page 32 MAINTENANCE Use Table 6 as a general maintenance guideline when servicing your engine. For more detailed engine maintenance information, refer to the engine owner’s manual supplied with your engine. Table 6. Engine Maintenance Schedule First Month Every 3 Every 6 Every Year Description Before...
  • Page 33 MAINTENANCE ENGINE OIL Perform scheduled maintenance procedures as defined by Table 6 and below. For more detailed engine maintenance NOTICE information, refer to the Honda engine owner’s manual. Drain the engine oil while the oil is warm. DAILY 1. Remove the engine oil dipstick, oil drain bolt, and „...

  • Page 34: Long Term Storage

    MAINTENANCE ENGINE AIR CLEANER b. Clean the foam filter element in warm, soapy water or a nonflammable solvent. Rinse and allow to dry 1. Remove the wing nut from the air cleaner cover, then thoroughly. Dip the element in clean engine oil remove the cover (Figure 35).

  • Page 35: Trailer Brakes

    TRAILER MAINTENANCE The following guidelines are to assist the operator with 6. Replace the adjusting hole cover. preventive maintenance of the trailer. 7. Repeat the above procedure on all brakes. TRAILER BRAKES 8. Lower the trailer to the ground. Properly functioning brake shoes and drums are essential Check the fluid level in the master cylinder reservoir at to ensure safety.

  • Page 36: Breakaway Cable

    TRAILER MAINTENANCE Hydraulic Brake Actuator Table 7. Hydraulic Brake Troubleshooting Symptom Possible Cause Solution The hydraulic brake actuator (Figure 37) is the No Brakes Brake line broken or kinked? Repair or replace. mechanism that activates the trailer’s brake system. This Brake lining glazed? Reburnish or replace.

  • Page 37: Breakaway Switch

    TRAILER MAINTENANCE Electric Brake Actuator Proper synchronization of the tow vehicle’s braking to the trailer’s braking can only be accomplished by road The electric brake actuator (Figure 39) is the mechanism testing. Brake lockup, grabbiness, or harshness is due that activates the trailer’s brake system. The breakaway to under-adjusted brakes or to lack of synchronization brake system includes a DC power source, a switch with a between the tow vehicle and the trailer being towed.
  • Page 38 TRAILER MAINTENANCE BREAKAWAY BRAKE ADJUSTABLE CHANNEL Your trailer may be equipped with an adjustable channel Breakaway Battery (Figure 40) that allows the coupler to be raised or lowered This battery supplies power to operate the trailer brakes if to a desired height. Periodically check the channel bolts the trailer uncouples from the tow vehicle.

  • Page 39: Wheel Bearings

    TRAILER MAINTENANCE WHEEL BEARINGS 1. Remove the dust cap, cotter pin, spindle nut and spindle washer, then remove the wheel hub and Wheel bearings (Figure 41) must be inspected and inspect the bearings for wear and damage. lubricated once a year or every 12,000 miles to ensure 2.
  • Page 40 TRAILER MAINTENANCE LEAF SUSPENSION DANGER The springs and associated components of the leaf NEVER crawl under the trailer unless it is on firm, level suspension (Figure 42) should be visually inspected every ground and resting on properly placed and secured 6,000 miles for signs of excessive wear, elongation of bolt jack stands.

  • Page 41: Trailer Safety Guidelines

    TRAILER SAFETY GUIDELINES The following guidelines are to assist the operator with the „ ALWAYS use lower gears for climbing and descending operation and handling of a trailer. grades. Safety precautions should be followed at all times when „ DO NOT ride the brakes while descending grades, they operating a trailer.

  • Page 42: Driving Conditions

    TRAILER SAFETY GUIDELINES DRIVING CONDITIONS The trailer VIN tag contains critical safety information for the use of your trailer. Again, be sure your hitch and tow When towing a trailer, you will have decreased acceleration, vehicle are rated for the Gross Vehicle Weight Rating of increased stopping distance, and increased turning radius your trailer.

  • Page 43: Inoperable Brakes, Lights Or Mirrors

    TRAILER SAFETY GUIDELINES Because of the signifi cant differences in all aspects of WARNING maneuverability when towing a trailer, the hazards and risks Use of a hitch with a load rating less than the load rating of injury are also much greater than when driving without of the trailer can result in loss of control and may lead a trailer.

  • Page 44: Tow Vehicle

    TRAILER SAFETY GUIDELINES The sum total of the GAWR for all trailer axles may be less CAUTION than the GVWR for the trailer, because some of the trailer For hydraulic brake models, ALWAYS ensure that load is to be carried by the tow vehicle, rather than by the backing up is done in a slow, straight, and steady trailer axle(s).

  • Page 45: Electrical Connector

    TRAILER SAFETY GUIDELINES SIDE-VIEW MIRRORS BREAKAWAY SYSTEM The size of the trailer that is being towed and your state If the trailer coupler connection comes loose, the breakaway law regulations determine the size of the mirrors. However, system can actuate emergency hydraulic brakes depending some states prohibit extended mirrors on a tow vehicle, on the type of actuator on the trailer.
  • Page 46 TRAILER SAFETY GUIDELINES Before each tow, coat the ball with a thin layer of WARNING automotive bearing grease to reduce wear and ensure A worn, cracked or corroded hitch ball can fail while proper operation. Check the locking device that secures towing and may result in death or serious injury.
  • Page 47 TRAILER SAFETY GUIDELINES Attaching Safety Chains „ Lower the trailer (Figure D) until the coupler fully engages the hitch ball. Visually inspect the safety chains and hooks for wear or 2-5/16 INCH damage. Replace worn or damaged safety chains and TRAILER COUPLER hooks before towing.
  • Page 48 TRAILER SAFETY GUIDELINES Breakaway Brake System Connecting Trailer Lights If the coupler or hitch fails, a properly connected and Connect the trailer lights to the tow vehicle’s electrical working breakaway brake system (Figure F) will apply the system using the electrical connectors at the front of the hydraulic brakes on the trailer.
  • Page 49 TRAILER SAFETY GUIDELINES PINTLE EYE COUPLER If you see or feel evidence of wear, such as fl at spots, deformations, pitting, or corrosion on the pintle hook or A pintle eye coupler (Figure G) connects to a pintle-hook coupler, immediately have your dealer inspect them to hitch that is located on or under the rear bumper of the tow determine the proper action to prevent possible failure of vehicle.

  • Page 50: Tire Safety

    TRAILER SAFETY GUIDELINES TIRE SAFETY WARNING Unsafe Tires, Lug Nuts, Or Wheels A defective pintle hitch not properly fastened can result in uncoupling, leading to death or serious injury. Trailer tires and wheels are more likely to fail than car tires Be sure the pintle hook is securely tightened to the tow and wheels because they carry a heavier load.
  • Page 51 TRAILER SAFETY GUIDELINES Lug nuts are also prone to loosen after first being There is a vehicle placard (Figure I) located in the same assembled. When driving a new trailer (or after wheels location as the certifi cation label described above. This have been remounted), check to make sure they are tight placard provides tire and loading information.

  • Page 52: Tire Fundamentals

    TRAILER SAFETY GUIDELINES Determining Load Limit Of Tow Vehicle Use the information contained in this section to make tire safety a regular part of your vehicle maintenance routine. Step 1. Recognize that the time you spend is minimal compared with the inconvenience and safety consequences of a fl at Locate the statement, “The combined weight of occupants tire or other tire failure.
  • Page 53 TRAILER SAFETY GUIDELINES Uniform Tire Quality Grading Standards (UTQGS) M+S: The “M+S” or “M/S” indicates that the tire has some mud and snow capability. Most radial tires have these Treadwear Number: This number indicates the tire’s wear markings; hence, they have some mud and snow capability. rate.
  • Page 54 TRAILER SAFETY GUIDELINES Load Range: This information identifies the tire’s NOTICE load-carrying capabilities and its infl ation limits. NEVER use a pneumatic air gun to tighten wheel lug Tire Safety Tips nuts. „ Slow down if you have to go over a pothole or other Over-tightening lug nuts will result in breaking the studs object in the road.
  • Page 55 TRAILER SAFETY GUIDELINES To check wheel bearings, jack the trailer and check wheels Table C. Tire Torque Requirements for side-to-side looseness. If the wheels are loose, or spin First Pass Second Pass Third Pass with a wobble, the bearings must be serviced or replaced. Wheel Size lbf·ft lbf·ft...
  • Page 56 TRAILER SAFETY GUIDELINES Figure M. Trailer To Tow Vehicle Wiring Diagram PAGE 56 — WT8C/WT8HP SERIES WATER TRAILERS • OPERATION MANUAL — REV. #0 (03/06/25)

  • Page 57: Troubleshooting

    TROUBLESHOOTING Troubleshooting (Pump) Symptom Possible Problem Solution Not enough priming water in the housing? Add water. Engine speed too low? Increase throttle. Strainer plugged? Clean strainer. Suction hose damaged? Replace or repair hose and clamps. Check that fittings are tight and properly Air leak at suction port? sealed.
  • Page 58 TROUBLESHOOTING Troubleshooting (Engine) Symptom Possible Problem Solution Spark plug bridging? Check gap, insulation or replace spark plug. Carbon deposit on spark plug? Clean or replace spark plug. Short circuit due to defi cient spark plug Check spark plug insulation, replace if worn. insulation? Improper spark plug gap? Set to proper gap.
  • Page 59 NOTES WT8C/WT8HP SERIES WATER TRAILERS • OPERATION MANUAL — REV. #0 (03/06/25) — PAGE 59...

  • Page 60: Here's How To Get Help

    © COPYRIGHT 2025, MULTIQUIP INC. Multiquip Inc . and the MQ logo are registered trademarks of Multiquip Inc. and may not be used, reproduced, or altered without written permission. All other trademarks are the property of their respective owners and used with permission.

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