Repair Instruction LP121HT Pump, To Check Valves

REPAIR INSTRUCTION - LP121HT PUMP

To Check Valves

Loosen valve plugs (48). Either with needle nose pliers or with a M12 screw, which can be threaded into the hole of the spring retainer (46D), take out discharge and inlet valve assemblies. Press onto the valve plate (46B) and twist to take apart the valve assembly. Check and replace worn parts. Tighten the plug to 107 ft.-lbs.

To Check Seals and Plungers

Loosen the eight nuts (49A) and take off the valve casing (43). Remove the seals (40) on the valve casing. Take seal sleeve (35) out of the guides in the crankcase (1) and remove the leakage seals (36).

Check plunger pipes (29B) for damage and remove any dirt. When replacing plunger pipes, use new copper rings (29D). Apply loctite on threads of plunger bolts (29C) and tighten to 33 ft.-lbs.

Check seals and replace as necessary.

Place new v-sleeves (40) along with support rings (41) in the valve casing (43). Place seals

(36)and pressure rings (39) in seal sleeve (35). Install the complete unit in the valve casing. Finally, fit in the complete pump head assembly carefully over the plunger pipes and evenly tighten nuts to 59 ft.-lbs.

To Dismantle Gear End

After removing the valve casing (1) and plunger pipes (29B), drain the oil. Take off crankcase cover (4) and bearing cover (14). Loosen connecting rod screws (24) and push the connecting rod/plunger base assembly forward (as far as possible) into the crosshead guides. Caution:

Connecting rods are marked for identification. Do not twist connecting rod halves. Connecting rods are to be reinstalled in the same position on the crankshaft journals.

Turning the crankshaft (22) slightly, hit it out carefully to the side with a rubber hammer.

Caution: Do not bend the connecting rod shanks. Check crankshaft and connecting rod surfaces, shaft seals (15) and taper roller bearings (20).

To Reassemble

Using a soft tool, press in the outer bearing ring until the outer edge is aligned with the outer edge of the bearing hole. Take off bearing cover (14) together with shaft seal (15) and o-ring (16). Fit crankshaft (22) through bearing hole on the opposite side. Press in outer bearing and tension it inwards with the bearing cover (keeping the shaft in a vertical position and turning slowly so that the taper rollers of the bearings touch the edge of the outer bearing ring). Adjust axial bearing clearance to at least 0.1mm and a maximum of 0.15mm by placing fitting discs (20A and 20B) under the bearing cover. Caution: After assembly, the crankshaft

(22)should turn easily with very little clearance. Tighten connecting rod screws (24) to

310 in.-lbs.

NOTE: Contact Giant Industries for Service School Information. Phone: (419)-531-4600

LP121HT specifications

The Giant LP121HT is a remarkable addition to the world of high-performance machinery, primarily designed for professionals in diverse industries such as construction, agriculture, and logistics. This versatile piece of equipment stands out due to its exceptional capabilities and modern technologies, making it a go-to choice for anyone looking to enhance productivity and efficiency on the job site.

One of the defining features of the LP121HT is its powerful engine, which combines high torque with low fuel consumption. This results in not only impressive performance but also significant cost savings over time. The engine complies with stringent environmental regulations, ensuring that it meets requirements for emissions while delivering robust power.

The design of the LP121HT is tailored for optimal maneuverability and ease of use. Its compact size allows it to navigate tight spaces while providing a stable base for heavy lifting tasks. The operating platform is ergonomically designed, offering a comfortable experience for the operator. This includes intuitive controls that facilitate precision handling, reducing operator fatigue over long work periods.

Moreover, the LP121HT incorporates advanced hydraulic technologies that enable smooth lifting and lowering operations. This hydraulic system is designed for rapid cycle times, allowing for quick and efficient movements. With a maximum lifting capacity that exceeds many of its competitors, the LP121HT is capable of handling demanding loads with ease.

Another highlight of the LP121HT is its robust safety features. Equipped with an overload protection system, the machine prevents potential hazards by alerting the operator when the weight exceeds safe limits. Additionally, the sturdy chassis and low center of gravity enhance stability, minimizing the risk of tipping during operation.

In terms of maintenance, the Giant LP121HT has been designed for user convenience. Key components are easily accessible, reducing downtime and simplifying routine checks. The use of high-quality materials ensures durability, allowing the machine to withstand the rigors of tough job environments.

Lastly, the LP121HT is compatible with a variety of attachments, increasing its versatility. Whether it is lifting pallets, transporting materials, or performing landscaping tasks, this machine adapts to the needs of various applications.

In conclusion, the Giant LP121HT, with its powerful engine, advanced hydraulic system, ergonomic design, and extensive safety features, is an exceptional tool that enhances operational efficiency across multiple industries. It is engineered to meet the demands of modern work environments, making it an indispensable asset for any professional.