Construction Equipment Repair
Mondak Equipment troubleshoots and repairs construction equipment in the field and in the shop. We work across the mechanical, hydraulic, electrical and electronic systems that have to work together to keep modern equipment productive.
When the Machine Isn't Right, You Need the Right Answer
You know your equipment. You know when it is losing power, running hotter than normal, moving slower, throwing a fault or simply not working the way it should.
The harder question is why.
Equipment We Work On
- Excavators
- Wheel loaders
- Dozers
- Skid steers & compact track loaders
- Backhoes
- Motor graders
- Articulated trucks
- Compact construction equipment
- Construction and equipment trailers
- Caterpillar
- John Deere
- Komatsu
- CASE
- Volvo
- Bobcat
- Kubota
- Takeuchi
- Hitachi and more
We Don't Start With a Parts List
A machine that will not move may have a transmission problem, or it may be a sensor, wiring fault, hydraulic issue, controller input or safety condition keeping it from moving.
A hydraulic function that is slow does not automatically mean it needs a pump.
A fault code tells us where to start. It does not always tell us what failed.
We diagnose the system before deciding what needs to be replaced.
Construction Equipment Repair & Diagnostics
We can help with:
- Diesel engine and power problems
- Hydraulic pumps, motors, valves and cylinders
- Hydraulic hose and hard-line failures
- Electrical and wiring problems
- Controllers, sensors and communication faults
- Transmission and drivetrain problems
- Steering and brake systems
- Cooling system problems
- Starting and charging systems
- Diesel emissions and aftertreatment faults
- Pins, bushings and worn pivot points
- Welding, fabrication and equipment repair
Sometimes the Problem Isn't Finding the Failure
Sometimes you already know what broke.
The problem is finding the part, or finding someone willing to repair the equipment when the original component is obsolete, unavailable or no longer supported.
That is where having repair, hydraulics, machining and fabrication capabilities working together matters.
Depending on the problem, the answer may be rebuilding the original component, finding an alternative, repairing a worn component, machining what is needed or modifying the equipment so it can keep working.
Field Repair When the Equipment Belongs on the Job
Not every excavator, loader or dozer needs to be hauled to a shop before someone can figure out what is wrong.
Mondak provides mobile field diagnostics and repair for heavy equipment, while larger component repairs and jobs better suited for the shop can be handled there.
Repair for five common construction machine types
Construction machines put hydraulic, mechanical, diesel and electronic systems to work at the same time. Mondak can come to the jobsite when practical or bring a larger repair into the shop.
Dozer Repair
We service crawler dozers used for grading, excavation, site preparation and heavy earthmoving. Repairs include hydraulic systems, diesel engines, transmissions, final drives, electrical systems, controls and related mechanical components.
Wheel Loader Repair
We repair wheel loaders used for material handling, loading and site work, including hydraulic pumps and motors, cylinders, valves, engines, transmissions, axles, differentials, electrical systems and controls.
Excavator Repair
Excavators depend heavily on their hydraulic systems. We diagnose and repair hydraulic pumps, motors, valves, cylinders, swing systems, travel systems, engines, electrical controls and related components.
Skid Steer Repair
We service skid steers and compact track loaders, including auxiliary hydraulics, attachment circuits, cylinders, pumps, motors, diesel engines, electrical systems and drivetrain components.
Backhoe Repair
We diagnose and repair hydraulic, mechanical, diesel and electrical systems on backhoes, including cylinders, pumps, valves, engines, transmissions, axles and controls.
Applications on construction equipment
Worn pins and bushings can leave mounting bores elongated, oversized or out of alignment. Portable line boring can restore the bore's size, position and alignment when replacing a bushing alone will not correct the wear.
- Bucket connections
- Loader arms
- Boom and stick connections
- Blade mounts
- Articulation points
- Other worn pivot locations
See portable line boring and bore welding for the complete inspection, setup, machining and finishing process.
Trace the problem through the system
A hydraulic problem can stop an excavator, loader or attachment circuit. Mondak diagnoses pumps, motors, cylinders, valves, control circuits, hoses, pressure, flow, leaks and contamination-related problems.
Our hydraulic services page covers system, component and hose work.
Keep the hauling equipment working with the machine
Mondak repairs construction and equipment trailers used to move machines to and around the jobsite. When a trailer problem interrupts that work, we can diagnose and repair its brake, running-gear, hydraulic, electrical or structural systems.
- Trailer brake systems
- Electric and hydraulic brakes
- Axles and suspension
- Wheel bearings and hubs
- Tires and wheels
- Hydraulic dump trailer systems
- Hydraulic cylinders
- Hydraulic hoses and fittings
- Trailer wiring and electrical systems
- Lighting
- Couplers and hitch components
- Deck and structural repairs
- Jacks and landing gear
- Trailer inspections and maintenance
Trailer spindle damage is covered on our spindle and axle-end repair page, where we inspect the assembly and decide whether to repair or replace it.
Follow the system that is causing the symptom
Diesel Engine and Powertrain
Loss of power, starting problems, transmission faults and final-drive symptoms may cross mechanical, hydraulic and electronic systems. See diesel engine and powertrain repair for the full diagnostic and component scope.
Diesel Emissions Systems
Aftertreatment faults can affect machine operation, and clearing a code does not always fix them. See diesel emissions cleaning and diagnostics for DPF, DOC, EGR, DEF and SCR service details.
Equipment Diagnostics
A fault code is the beginning of diagnosis. Mondak uses professional diagnostic equipment to communicate with machine controls, identify faults and monitor operating parameters before recommending the repair. Engine and drivetrain diagnosis continues on powertrain repair, while aftertreatment faults continue on diesel emissions services.
Preventive Maintenance
Scheduled PM can follow equipment hours, manufacturer requirements and operating conditions. It can include inspections, fluid and filter service, lubrication, hydraulic and electrical checks, and equipment-condition documentation. See equipment inspections and mobile field service for related field work.
Answers for this service
What construction machines does Mondak commonly service?
Our construction equipment service includes dozers, wheel loaders, excavators, skid steers and backhoes, along with their hydraulic, diesel, electrical and powertrain systems.
Why would an excavator lose hydraulic power?
Possible causes include pump problems, control-valve issues, pilot pressure problems, relief settings, electrical controls, hydraulic contamination or other system failures.
Testing the system is necessary before deciding which component needs to come apart.
What can cause a wheel loader to move slowly?
Low hydraulic pressure or flow, drivetrain problems, engine performance, transmission issues, control problems or excessive internal leakage can all affect machine performance.
The machine needs to be tested rather than assuming the hydraulic pump is the culprit.
Why should construction equipment receive preventive maintenance?
Construction equipment often works under high loads and harsh conditions. Catching leaks, worn pins, electrical issues, contaminated fluids or developing hydraulic problems early can prevent major downtime.
What trailer repairs does Mondak perform?
Our specialized trailer service includes spindle repair and replacement along with other supported mechanical, hydraulic and fabrication work.
Fix the Problem. Get Back to Work.
Whether you already know what failed or need help figuring it out, start with the machine.
Tell us the manufacturer, model, location and what it is doing. We'll start there.